I am experiencing EXACTLY the same issues as you. Was on the phone for 3 hours today. Twice with Security Account Assurance team (Useless, not helpful, said there are no supervisors and ended up hanging up on me). They tried to transfer me to Mobile care (on with them for one hour, talked to supervisor and told me that the Security Account assurance team is the next higher level of support and transferred me back there. So frustrating!!! I have tried logging on from web browser (Chrome and Microsoft Edge), cleared cookies, tried logging on from my Samsung Galaxy phone, both web browser and Xfinity mobile app with no success. Same error page that says I am not the primary user. I also have tried my user ID, comcast email and my phone #. I did confirm on the xfinity website that I AM the primary account holder.
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