I'm attempting to pay my first AMF with a card and receiving this:
Single Sign-On Error
We can't log you in. Check for an invalid assertion in the SAML Assertion Validator (available in Single Sign-On Settings) or check the login history for failed logins.
@DarrenT Can you please email firstname.lastname@example.org with your name, contact info, member ID and the SSO issue you are experiencing? They should be able to fix your account ASAP.