Running latest pre release 2022.02.03.2057
I relented & installed the Windows 11 Update.
There are now 3 channels I had access to previously (through my Frontier Communications account) that are now greyed out:
Channel #6113 Discovery Life
403: Not permitted to watch. (access.denied.missingpackage)
Channel #6126 Freeform
notAuthorized: You are not authorized to view this content.
Channel #6127 FreeformP
notAuthorized: You are not authorized to view this content.
I've removed Frontier as a source then re-added it. Edit/rescan hasn't resolved the issue.