This error message would mean your PAYE online credentials are wrong, or expired. If it is the former, please re-type existing credentials, or if latter, request new details from HMRC if not available internally.
ā
If after using the correct credentials, you still cannot login, please contact HMRC and ask if you have CIS validation turned on for the Employer in question.
CIS Return - Authentication Error
Learn what to do if, when end user tries to send a CIS return, they get presented with the below error message: Message Id: Authentication Failure: The supplied user credentials failed validation for requested service.
Written by Terence Cassidy