Hello, I've received this error for over a week now and have received 2 phone calls back, none from the apparent tier 2 team that can resolve
fastest fix so far is to create a new email (username) to use to log in. The issue is that your current username has been used on a previous account and has to be fixed in the databases only to point to your current address/account. (800-Comcast, billing).
Thank you for posting your question here in the Xfinity Forum. We sincerely apologize for the inconvenience that you have experienced.
Can you please log out of the Xfinity Stream website completely, clear your browsers cache and cookies, and log back into the website?
Please let us know if you continue to experience this issue.