Bad Authentication Method

The authentication method specified in the CONNECT packet is not supported or does not match the currently-in-use authentication method. Sent in a CONNACK or DISCONNECT packet.

References

docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html

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BadAuthenticationMethod BadUserNameOrPassword Banned ClientIdentifierNotValid ConnectionRateExceeded ContinueAuthentication