Authentication failing in kubernetes cluster deployment

I have set up my yaml file based on the deployment example. When I start up couchbase, and try to access it, I am getting the following:
{“@timestamp”:“2021-06-16T16:21:01.428Z”,“@version”:“1”,“message”:“[com.couchbase.io][SaslAuthenticationFailedEvent][704ms] Authentication Failure - Potential causes: invalid credentials or if LDAP is enabled ensure PLAIN SASL mechanism is exclusively used on the PasswordAuthenticator (insecure) or TLS is used (recommended) {"circuitBreaker":"DISABLED","coreId":"0x517bcc9700000001","remote":"clustertest-srv:11210","status":"UNKNOWN","type":"KV","xerror":{"ref":"e64648ba-a8cc-4233-a297-a30893aefb6b"}}”,“logger_name”:“com.couchbase.io”,“thread_name”:“cb-events”,“level”:“ERROR”,“level_value”:40000}

{“@timestamp”:“2021-06-16T16:21:01.430Z”,“@version”:“1”,“message”:“[com.couchbase.io][SaslAuthenticationFailedEvent][710ms] Authentication Failure - Potential causes: invalid credentials or if LDAP is enabled ensure PLAIN SASL mechanism is exclusively used on the PasswordAuthenticator (insecure) or TLS is used (recommended) {"bucket":"buckettest","circuitBreaker":"DISABLED","coreId":"0x517bcc9700000001","remote":"clustertest-srv:11210","status":"UNKNOWN","type":"KV","xerror":{"ref":"f0a0eff9-dc5a-48a0-f99d-3aec39c570fc"}}”,“logger_name”:“com.couchbase.io”,“thread_name”:“cb-events”,“level”:“ERROR”,“level_value”:40000}

{“@timestamp”:“2021-06-16T16:21:01.433Z”,“@version”:“1”,“message”:“[com.couchbase.endpoint][EndpointConnectionFailedEvent][1596ms] Connect attempt 1 failed because of AuthenticationFailureException: Authentication Failure - Potential causes: invalid credentials or if LDAP is enabled ensure PLAIN SASL mechanism is exclusively used on the PasswordAuthenticator (insecure) or TLS is used (recommended) {"circuitBreaker":"DISABLED","coreId":"0x517bcc9700000001","remote":"clustertest-srv:11210","type":"KV"}”,“logger_name”:“com.couchbase.endpoint”,“thread_name”:“cb-events”,“level”:“WARN”,“level_value”:30000,“stack_trace”:“com.couchbase.client.core.error.AuthenticationFailureException: Authentication Failure - Potential causes: invalid credentials or if LDAP is enabled ensure PLAIN SASL mechanism is exclusively used on the PasswordAuthenticator (insecure) or TLS is used (recommended)\n\tat com.couchbase.client.core.io.netty.kv.SaslAuthenticationHandler.failConnect(SaslAuthenticationHandler.java:486)\n\tat com.couchbase.client.core.io.netty.kv.SaslAuthenticationHandler.maybeFailConnect(SaslAuthenticationHandler.java:294)\n\tat com.couchbase.client.core.io.netty.kv.SaslAuthenticationHandler.channelRead(SaslAuthenticationHandler.java:251)\n\tat com.couchbase.client.core.io.netty.kv.MemcacheProtocolVerificationHandler.channelRead(MemcacheProtocolVerificationHandler.java:85)\n\tat java.base/java.lang.Thread.run(Thread.java:834)\n”}

The is running on a MAC. I have checked the base64 encoding of the username and password. I don’t believe LDAP is on, this may be a TLS issue. If it is, not sure what I need to do.

Did you manage to solve this problem?
I have the same problem in a deployment that connects to couchbase

:{“ref”:“2e7ec271-4512-4719-1d50-650cf70b3745”}}
[cb-events] [core-d68c899d4-n5ggk] [2023-03-27 13:33:20,015] [ERROR] [com.couchbase.io] - [com.couchbase.io][SaslAuthenticationFailedEvent][109ms] Authentication Failure - Potential causes: invalid credentials or if LDAP is enabled ensure PLAIN SASL mechanism is exclusively used on the PasswordAuthenticator (insecure) or TLS is used (recommended) {“circuitBreaker”:“DISABLED”,“coreId”:“0xbce06cbe00000001”,“remote”:“10.20.164.80:11210”,“status”:“UNKNOWN”,“type”:“KV”,“xerror”:{“ref”:“e11b0cd8-b465-4d6e-3d4d-d0b6d14b0c95”}}
[cb-events] [core-d68c899d4-n5ggk] [2023-03-27 13:33:20,015] [ERROR] [com.couchbase.io] - [com.couchbase.io][SaslAuthenticationFailedEvent][101ms] Authentication Failure - Potential causes: invalid credentials or if LDAP is enabled ensure PLAIN SASL mechanism is exclusively used on the PasswordAuthenticator (insecure) or TLS is used (recommended) {“circuitBreaker”:“DISABLED”,“coreId”:“0xbce06cbe00000001”,“remote”:“10.20.164.90:11210”,“status”:“UNKNOWN”,“type”:“KV”,“xerror”:{“ref”:“f3481775-630c-45f7-40d3-5df6b69f64de”}}

Looks like this may have been resolved in more recent versions, are you able to try again and report back? Issue with file permissions setting up Couchbase Backup using Operator

Or this may help: Authentication | Couchbase Docs