Max does not allow or recognize my ATT login

I would like a solution from ATT to troubleshoot MAX.  I have deleted the MAX app and reinstalled, I have turned off my devices to reboot, I have changed my ATT password, I have logged into 2 different search engines on my desktop, I have exhausted all the posted links for help….and I verified that Max is indeed a part of my ATT wireless plan.

Please advise so I can watch MAX which is a part of my paid ATT plan.

Thank you.