The Username/Password authentication endpoint is missing from the Metadata Exchange (MEX) document that is published by the federation server proxy.
\Admin_Applications\SSO_Diagnostic_Tests\ADFSDiagnostic.txt
In addition, you may notice one of the following symptoms when you sign in to Office 365 resources by using single sign-on (SSO)-enabled user ID credentials:- Rich client application authentication fails when it tries to access services remotely from an Internet-connected client computer.
- Microsoft Exchange Online client application authentication fails when it connects to resources.