Hello
I have a Azure AD repository with two domains where one of the domains is federated.
I'm getting the ACS20012 error message when I try to log in to my asp.net mvc test application with a federated user account:
"https://login.windows.net/fd8aa3de-5344-446b-a73e-0896ef3e99a7/wsfed?f=255&MSPPError=-2147190612
ACS20012:
The request is not a valid WS-Federation protocol message."
If I log on with a non-federated account then everything works. Also if I remove federation from the federated domain then I can log on with any account.
The Single Sign-On Test from Remote Connectivity Analyzer (https://www.testexchangeconnectivity.com/) reports no errors.
Any ideas how to debug and resolve this issue?
Thanks.