I likewise was able to use my AT&T wireless number/password to login using the DIRECTV option. I have only DIRECTVNOW, and no traditional DIRECTV service.
Not sure if it actually works or not because of course not a single app supports SSO.
Edit: Tried the AE App and got this system UI alert which is obviously linked to SSO. Didn't actually work though.
Not sure if it actually works or not because of course not a single app supports SSO.
Edit: Tried the AE App and got this system UI alert which is obviously linked to SSO. Didn't actually work though.

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