TV Remote app stuck on old (inactive) account linked to ID

I recently opened a new account and at the same time closed an existing account, both under my one Xfinity ID. Now that I've returned my equipment from the old account, I appear to be 'stuck' on the old inactive account whenever I try to use the TV Remote app - instead of seeing my two TV boxes and all of my package's channels, I get zero channels listed, no 'DVR' option in the UI at all, and the settings screen in the app refers to my old, now-returned devices.

I've tried logging out and back in, uninstalling and reinstalling the app, different devices (for the app itself) all to no avail. I tried seeing if I can 'switch' default account, but it's already locked to my newer one; the old account is now marked as inactive and cannot be unlinked (due to final payment processing.)