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When you move you might expect Comcast to move your logins from the old account to the new one, but they often don't. Instead, they create a new Primary login which they may or may not tell you about.
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.
If the IDs are not as you expect, contact one of their reps at the phone number on your bill or 1-800-Comcast, or use one of the other options on https://www.xfinity.com/support/contact-us/ and have them fix the problem. You might have better luck with their Comcast Security Assurance department. You can reach them at 1-888-565-4329 (from https://internetsecurity.xfinity.com/help/report-abuse/).
Hi @ams68 ,
Your default account was set to your old one, we've made back-end changes to prevent this from happening (always setting the newer account as the default during a move/transfer) so we're investigating how this one slipped. You should be able to sign in now, let me know if it's still an issue.
For the forum folks, there were some different actions we've had to take on the overall issue to resolve, please feel free to refer to this so you can skip the need to call in:
@ams68 was able to go to a retail store and swap out his XB6 that was overheating for an XB7 and things are working fine now.