[barney63]

Yes, I've found it and installed it (xbian kodi v20.2 bookworm aarm64 version, latest update on my RasPi4b)
It doesn't seem to want to authorize/authenticate with my email addy, and that's preventing me from adding it to my IPTV Simple setup using Matt Huisman's IPTV Merge...which I now realize may not be an approved add-on.  
I seem to recall going through this before - it has something to do with me using "sign in with google" in the Gem app on my phone...can't remember how I fixed it

Yes, definitely you should have a GEM account and not sign in through a third party (Google). Signing up for a GEM account is free and easy to do.  Just to isolate the issue, I am using the latest CBC addon (4.0.17+matrix.1) with IPTV Merge and all are working fine.

Kodi 20.2/Win 7