@Spoelstra7 wrote: ... I'm greeted with the phrase in the subject line. ...
Double check your UserIDs on your home system with the Lookup tool at https://idm.xfinity.com/myaccount/lookup. After you enter the requested information you'll see a list of the UserIDs on your account and an indication of which one is Primary. Be aware that the Primary UserID online doesn't always correspond with a name on your billing statement.
If the ID you are using is not Primary, you'll need to log in with the Primary ID.
I'm having the same issue. I have moved multiple times and something is causing a hangup. I've tried everything suggested but keep getting stuck in a loop that ends with "contact acount owner"