Add a second line-up, use a boston zipcode and choose the boston OTA listing, then add WSBK manually, you will need to scroll to the bottom of the channel choices in the setup to find it. It will show up out of order on the guide but it will now work and show EPG info at least.
The Comcast Hartford listing has been missing sub-channels for 2+ years now and i’ve submitted multiple requests to get them to correct it and as usual, its ignored. At least now with multi-epg we can sort of work around it.
Please raise a new topic on this
To investigate I would need zip code, lineup name and confirmation that the missing channel is available through your provider
The issue with the same channel number appearing more than once in the lineup and not being able to select the right one for matching will be fixed in hosted Plex Web 4.75 which will get released soon - available through https://app.plex.tv/desktop