According to my knowledge,
Yes, there is a Communication channel of Catrobat on various platforms:-
Slack Channel:- It is only for official developers of the Catrobat Community.
Discord Channel:- It is mainly for Users of Catrobat/Pocket-code only.
According to my knowledge, there is not any Communication channel in Google meet.
So, to ask any queries regarding the codebase I suggest you use this Google Group. The developers and Admins of the projects are also connected in this group. they will solve your query here.
All the best :)
Aman