I've called and chatted Xfinity support several times about this, hoping I get a different answer or solution here.
Does anyone have a solution? It's really frustrating!
Sounds like both accounts are associated with the same address, correct? Is there a balance still owed on the old account? Have you/can you contact the primary account holder of the old account? Is your login profile a new one and not the old one used on the old account?
You'll need to log into the original account and remove yourself from it. There will be a full solution at the very latest by the end of Q1 to unlink yourself.
In the meantime, use the following link to set the default globally to the current account:
Thanks for your patience on the matter!