I have long held an sbcglobal.net e-mail address and accessed it through Yahoo. Now, whenever I try to check my e-mail, I am presented with the a request to sign in to att.net (which I never had to do before), and when I log in with my normal credentials, I receive the following error message:
Welcome to att.net!
We noticed that you logged in to att.net with an AT&T Access ID that does not have an email address associated with it. If you have an AT&T email address (i.e. email@example.com or firstname.lastname@example.org), please use this when you log in to att.net.
Or, you may link your email to your AT&T Access ID by going to myAT&T. This would allow you, in the future, to use either your full email address or just your AT&T Access ID (i.e. johnsmith) when you log in to att.net.
So I followed the link to link my e-mail address to my AT&T Access ID, but when I do that it tells me that the my e-mail address is already linked to my AT&T Access ID (which is not surprising, because it always has been).
After I have logged in to att.com (as part of the previous process), if I go to log in to my e-mail through yahoo.com again, I am now presented with a different error message:
FBTSML215E The name identifier policy in the authentication request could not be met by this identity provider.