Unable to connect C++ consumer client with OAUTHBEARER mechanism to server

[Webwizzzz]

We are trying to connect a C++ consumer client with a Kafka Topic using the OAUTHBEARER mechanism using libkafkard version '2.3.0'. We seem to be able to get the bearer token but can not establish a permanent connection with the broker. We don't have a network or server configuration issue, because we are able to connect from the same client host with a java client to this topic using the same OAUTHBEARER mechanism.

We use there parameters:
security.protocol=SASL_SSL,
sasl.mechanism=OAUTHBEARER,
sasl.oauthbearer.token.endpoint.url=https://login.microsoftonline.com/****/oauth2/v2.0/token,
auto.offset.reset=earliest,
sasl.oauthbearer.method=oidc,
sasl.oauthbearer.client.id=our-client-id,
sasl.oauthbearer.client.secret=ourclientsecret,
sasl.oauthbearer.scope=our-client-id/.default,
sasl.oauthbearer.extensions=identity-pool-id=our-pool-id,
debug=all,
group.id=our-group-id

Here are our relevant log messages:

24/03/20 15:17:30,510 [Connection/140131041339136] Kafka: (7) [[thrd:app]: Selected provider OAUTHBEARER (builtin) for SASL mechanism OAUTHBEARER]
24/03/20 15:17:30,510 [Connection/140131041339136] Kafka: (7) [[thrd:app]: Using OpenSSL version OpenSSL 1.1.1k FIPS 25 Mar 2021 (0x101010bf, librdkafka built with 0x101010bf)]
24/03/20 15:17:30,510 [Connection/140131041339136] Kafka: (7) [[thrd:app]: Group "our-group-id": updating member id "(not-set)" -> ""]
24/03/20 15:17:30,510 [Connection/140131041339136] Kafka: (7) [[thrd:app]: GroupCoordinator: Enabled low-latency ops queue wake-ups]
24/03/20 15:17:30,510 [Connection/140131041339136] Kafka: (7) [[thrd:app]: GroupCoordinator: Added new broker with NodeId -1]
24/03/20 15:17:30,510 [Connection/140131041339136] Kafka: (7) [[thrd:GroupCoordinator]: GroupCoordinator: Enter main broker thread]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Group "our-group-id" changed state init -> query-coord (join-state init)]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Broadcasting state change]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Group "our-group-id": no broker available for coordinator query: intervaled in state query-coord]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Enabled low-latency ops queue wake-ups]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Added new broker with NodeId -1]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd::0/internal]: :0/internal: Enter main broker thread]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: librdkafka v2.3.0 (0x20300ff) host-application-name#consumer-1 initialized (builtin.features gzip,snappy,ssl,sasl,regex,lz4,sasl_gssapi,sasl_plain,sasl_scram,plugins,zstd,sasl_oauthbearer,http,oidc, GCC GXX PKGCONFIG INSTALL GNULD LDS C11THREADS LIBDL PLUGINS ZLIB SSL SASL_CYRUS ZSTD CURL HDRHISTOGRAM LZ4_EXT SYSLOG RAPIDJSON SNAPPY SOCKEM SASL_SCRAM SASL_OAUTHBEARER OAUTHBEARER_OIDC CRC32C_HW, debug 0xfffff)]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Enter main broker thread]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: Client configuration:]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: client.id = host-application-name]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: client.software.version = 2.3.0]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: metadata.broker.list = pkc-99999.westeurope.azure.confluent.cloud:9092]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: debug = generic,broker,topic,metadata,feature,queue,msg,protocol,cgrp,security,fetch,interceptor,plugin,consumer,admin,eos,mock,assignor,conf,all]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: socket.timeout.ms = 5000]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: error_cb = 0x7f72db8de8b9]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: throttle_cb = 0x7f72db8de9cc]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: stats_cb = 0x7f72db8dea91]
24/03/20 15:17:30,511 [Connection/140131041339136] Kafka: (7) [[thrd:app]: log_cb = 0x7f72db8de782]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: opaque = 0x7f72c4118b48]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: default_topic_conf = 0x7f72c4119570]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: security.protocol = sasl_ssl]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: ssl_key = [redacted]]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: sasl.mechanisms = OAUTHBEARER]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: oauthbearer_token_refresh_cb = 0x7f72d545eac9]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: sasl.oauthbearer.method = oidc]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: sasl.oauthbearer.client.id = our-client-id]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: sasl.oauthbearer.client.secret = ourclientsecret]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: sasl.oauthbearer.scope = our-client-id/.default]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: sasl.oauthbearer.extensions = identity-pool-id]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: sasl.oauthbearer.token.endpoint.url = https://login.microsoftonline.com/****/oauth2/v2.0/token]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: group.id = our-group-id]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: enable.auto.commit = true]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: fetch.wait.max.ms = 5]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: fetch.min.bytes = 1024]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: Default topic configuration:]
24/03/20 15:17:30,512 [Connection/140131041339136] Kafka: (7) [[thrd:app]: auto.offset.reset = smallest]
24/03/20 15:17:30,513 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Group "our-group-id" received op ASSIGN in state query-coord (join-state init)]
24/03/20 15:17:30,513 [Connection/140131041339136] Kafka: (7) [[thrd:main]: No current assignment to clear]
24/03/20 15:17:30,513 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Assignment dump (started_cnt=0, wait_stop_cnt=0)]
24/03/20 15:17:30,513 [Connection/140131041339136] Kafka: (7) [[thrd:main]: List with 0 partition(s):]
24/03/20 15:17:30,513 Last message repeat 3 times.
24/03/20 15:17:30,513 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Group "our-group-id": assignment operations done in join-state init (rebalance rejoin=false)]
24/03/20 15:17:30,513 [Connection/140131041339136] Kafka: (7) [[thrd:main]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Selected for cluster connection: coordinator query (broker has 0 connection attempt(s))]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Group "our-group-id": no broker available for coordinator query: intervaled in state query-coord]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Received CONNECT op]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Broker changed state INIT -> TRY_CONNECT]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: Broadcasting state change]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Group "our-group-id" received op ASSIGN in state query-coord (join-state init)]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Group "our-group-id": new assignment of 1 partition(s) in join-state init]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: No current assignment to clear]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: New local topic: our.topic]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: NEW our.topic [-1] 0x7f72ac002c40 refcnt 0x7f72ac002cd0 (at rd_kafka_topic_new0:472)]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Topic "our.topic" configuration (default_topic_conf):]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: auto.offset.reset = smallest]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: NEW our.topic [0] 0x7f72ac003370 refcnt 0x7f72ac003400 (at rd_kafka_toppar_desired_add:645)]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: our.topic [0]: marking as DESIRED]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: our.topic [0]: adding to DESIRED list]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Added 1 partition(s) to assignment which now consists of 1 partition(s) where of 1 are in pending state and 0 are being queried]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Assignment dump (started_cnt=0, wait_stop_cnt=0)]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: List with 1 partition(s):]
24/03/20 15:17:30,514 [Connection/140131041339136] Kafka: (7) [[thrd:main]: our.topic [0] offset STORED]
24/03/20 15:17:30,515 [Connection/140131041339136] Kafka: (7) [[thrd:main]: List with 1 partition(s):]
24/03/20 15:17:30,515 [Connection/140131041339136] Kafka: (7) [[thrd:main]: our.topic [0] offset STORED]
24/03/20 15:17:30,515 [Connection/140131041339136] Kafka: (7) [[thrd:main]: List with 0 partition(s):]
24/03/20 15:17:30,515 Last message repeat 1 time.
24/03/20 15:17:30,515 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Pending assignment partition our.topic [0] can't fetch committed offset yet (cgrp state query-coord, awaiting 0 commits, 0 partition(s) already being queried)]
24/03/20 15:17:30,515 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Current assignment of 1 partition(s) with 1 pending adds, 0 offset queries, 0 partitions awaiting stop and 0 offset commits in progress]
24/03/20 15:17:30,515 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Not selecting any broker for cluster connection: still suppressed for 49ms: coordinator query]
24/03/20 15:17:30,515 [Connection/140131041339136] Kafka: (7) [[thrd:main]: Group "our-group-id": no broker available for coordinator query: intervaled in state query-coord]
24/03/20 15:17:31,515 [Connection/140131041339136] Info: Loop ...
24/03/20 15:17:31,515 [Connection/140131041339136] Kafka: (7) [[thrd:background]: Waking up waiting broker threads after setting OAUTHBEARER token]
24/03/20 15:17:31,515 [Connection/140131041339136] Kafka: (7) [[thrd:background]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Wake-up: OAUTHBEARER token update]
24/03/20 15:17:31,515 [Connection/140131041339136] Kafka: (7) [[thrd:background]: Wake-up sent to 1 broker thread in state >= TRY_CONNECT: OAUTHBEARER token update]
24/03/20 15:17:31,515 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: broker in state TRY_CONNECT connecting]
24/03/20 15:17:31,515 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Broker changed state TRY_CONNECT -> CONNECT]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: Broadcasting state change]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Connecting to ipv4#20.31.55.65:9092 (sasl_ssl) with socket 7]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Connected to ipv4#20.31.55.65:9092]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Broker changed state CONNECT -> SSL_HANDSHAKE]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: Broadcasting state change]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Enabled endpoint identification using hostname pkc-99999.westeurope.azure.confluent.cloud]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Broker SSL certificate verified]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Connected (#1)]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Updated enabled protocol features +ApiVersion to ApiVersion]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Broker changed state SSL_HANDSHAKE -> APIVERSION_QUERY]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: Broadcasting state change]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Sent ApiVersionRequest (v3, 63 bytes @ 0, CorrId 1)]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Received ApiVersionResponse (v3, 725 bytes, CorrId 1, rtt 1.73ms)]
24/03/20 15:17:31,516 [Connection/140131041339136] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Broker API support:]
...
24/03/20 14:21:28,932 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: ApiKey DescribeTransactions (65) Versions 0..0]
24/03/20 14:21:28,932 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: ApiKey ListTransactions (66) Versions 0..0]
24/03/20 14:21:28,932 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: ApiKey AllocateProducerIds (67) Versions 0..0]
24/03/20 14:21:28,932 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: ApiKey Unknown-68? (68) Versions 0..0]
24/03/20 14:21:28,932 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: ApiKey Unknown-69? (69) Versions 0..0]
24/03/20 14:21:28,932 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: ApiKey Unknown-10000? (10000) Versions 0..4]
24/03/20 14:21:28,932 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: ApiKey Unknown-10001? (10001) Versions 0..1]
...
24/03/20 14:21:33,044 [Connection/139785840895744] Info: Loop ...
24/03/20 14:21:33,044 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Cluster connection already in progress: coordinator query]
24/03/20 14:21:33,044 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Group "our-group-id": no broker available for coordinator query: intervaled in state query-coord]
24/03/20 14:21:33,044 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Not selecting any broker for cluster connection: still suppressed for 49ms: coordinator query]
...
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Topic our.topic [0]: stored offset INVALID (leader epoch -1), committed offset INVALID (leader epoch -1): not including in commit]
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Assignment dump (started_cnt=0, wait_stop_cnt=0)]
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: List with 1 partition(s):]
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: our.topic [0] offset STORED]
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: List with 1 partition(s):]
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: our.topic [0] offset STORED]
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: List with 0 partition(s):]
24/03/20 14:21:33,064 Last message repeat 1 time.
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Pending assignment our.topic [0] can't fetch committed offset yet (cgrp state query-coord, awaiting 0 commits, 0 partition(s) already being queried)]
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Current assignment of 1 partition(s) with 1 pending adds, 0 offset queries, 0 partitions awaiting stop and 0 offset commits in progress]
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Not selecting any broker for cluster connection: still suppressed for 41ms: coordinator query]
24/03/20 14:21:33,064 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Group "our-group-id": no broker available for coordinator query: intervaled in state query-coord]
...
24/03/20 14:21:33,071 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Topic our.topic metadata information unknown]
24/03/20 14:21:33,071 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Topic our.topic partition count is zero: should refresh metadata]
24/03/20 14:21:33,071 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Not selecting any broker for cluster connection: still suppressed for 41ms: refresh unavailable topics]
24/03/20 14:21:33,071 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Hinted cache of 1/1 topic(s) being queried]
24/03/20 14:21:33,071 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Skipping metadata refresh of 1 topic(s): refresh unavailable topics: no usable brokers]
24/03/20 14:21:33,071 [Connection/139785840895744] Kafka: (7) [[thrd:main]: Not selecting any broker for cluster connection: still suppressed for 41ms: no cluster connection]
24/03/20 14:21:34,071 [Connection/139785840895744] Kafka: (5) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Timed out SaslAuthenticateRequest in flight (after 5003ms, timeout #0)]
24/03/20 14:21:34,071 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: SASL authentication error: SaslAuthenticateRequest failed: Local: Timed out (after 5003ms in state AUTH_REQ) (_TIMED_OUT)]
24/03/20 14:21:34,071 [Connection/139785840895744] Kafka: (3) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: SASL authentication error: SaslAuthenticateRequest failed: Local: Timed out (after 5003ms in state AUTH_REQ)]
24/03/20 14:21:34,071 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Broker changed state AUTH_REQ -> DOWN]
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: Broadcasting state change]
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Purging bufq with 0 buffers]
24/03/20 14:21:34,072 Last message repeat 1 time.
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Updating 0 buffers on connection reset]
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: Cluster connection already in progress: broker down]
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: Hinted cache of 1/1 topic(s) being queried]
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: Skipping metadata refresh of 1 topic(s): broker down: no usable brokers]
24/03/20 14:21:34,072 [Connection/139785840895744] Error: Kafka error sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: SASL authentication error: SaslAuthenticateRequest failed: Local: Timed out (after 5003ms in state AUTH_REQ)
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (4) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Timed out 1 in-flight, 0 retry-queued, 0 out-queue, 0 partially-sent requests]
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Broker changed state DOWN -> INIT]
24/03/20 14:21:34,072 [Connection/139785840895744] Error: Kafka error 1/1 brokers are down
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (7) [[thrd:sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/boot]: Broadcasting state change]
24/03/20 14:21:34,072 [Connection/139785840895744] Kafka: (7) [[thrd:main]: sasl_ssl://pkc-99999.westeurope.azure.confluent.cloud:9092/bootstrap: Selected for cluster connection: coordinator query (broker has 1 connection attempt(s))]

[Webwizzzz]

Any thoughts on this problem? Are more details needed?