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As suggested in the above process, a two new error code codes shall be implemented for internal authentication failure:

BROKER_AUTHORIZATION_FAILURE(92, "Authorization failed for the request during forwarding. This indicates an internal error on the broker cluster security setup.", BrokerAuthorizationFailureException::new);
PRINCIPAL_DESERIALIZATION_FAILURE(93, "Request principal deserialization failed during forwarding. " +
"This indicates an internal error on the broker cluster security setup.", PrincipalDeserializationFailureException::new)

Unfortunately for older admin clients they couldn't interpret this code, so an UNKNOWN_SERVER_ERROR will be presented, which is less ideal but still good enough to motivate users to check the broker side log for authorization failure. We intended to avoid returning AUTHORIZATION failure to the old client so that users don't waste time debugging any client side security setup.

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