Same issue with my account. Attempting to link to account sends me to Xfinity 'add to plan' message. I can logon to HBOmax with my email and pw - from there when I check 'billing information' under my account sign-on it tells me that my HBOmax subscription through Xfinity has expired. My profiles and recent/up next content loads on my HBOmax main page - so it knows me and my previous (working) account info. Seems to be a mismatch between Xfinity and HBOmax. My account shows HBO as part of it - along with Streampix. I'm trying the 'sign out of all devices' option and will try again in few hours. Until then - posting this as a potential fragment to the answer.
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