I sincerely apologize for the inconvenience you may be experiencing. A user can be banned from the Xfinity Forum for a number of reasons. Our most prevalent reason for a ban is because of someone putting their email address on our Do Not Email list. The system will then automatically ban the associated Xfinity Forum username to prevent our automatic forum emails from reaching the email. We are always happy to reverse those bans if you approve those automated emails being sent to you.
However, there is another type of ban, a behavioral ban. This type of ban is due to one or more violation of our Xfinity Forum Guidelines and/or our Xfinity Forum Acceptable Use Policy (found here: https://forums.xfinity.com/t5/Guidelines/Xfinity-Forum-Guidelines/td-p/3115028 & here: https://forums.xfinity.com/t5/Guidelines/Xfinity-Forum-Acceptable-Use-Policy/td-p/2618379). We never want to get to that point with any user so we ask that all users familiarize themselves with those guidelines to prevent any future issues.
Remember, by having an account and utilizing these forums, you have hereby agreed to the rules, policies, and guidelines contained within those documents as well as any other posted documents throughout the community.
I have also sent you a private message per your request. Please let me know if you have any other questions or would like to know more.