AUTH/ROOM_MISMATCH
The room/realm id asserted by the client does not match what the server stored for this token.
Classification
Application code. The wire value and spelling remain the same in every language. A registered code does not establish that its feature is active in every deployment.
Handling
Separate player reauthentication from server configuration or storage failures. Start a new provider flow when the login attempt is invalid; investigate signing configuration and storage on the server when appropriate. Never request a private key, mnemonic or callback token in a report.