SAML suddently stopped working with ADFS 3.0 on March 23 2018. It's been working fine (claim rule is "SAM-Account-Name > Name ID, urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified"). The error occurred after it successfully checked the password, and look like a mismatched id.
But it works with our ADFS 2.0 server with the same settings.
We can confirm ADFS3.0 is working for other IDPs.
Any help will be highly appreciated.