Yes, I've had this. No idea how to solve it. I just searched for the community instead.

Seems like a current bug, I would like that I could add communities easier from here... maybe someday.

Same issue here. Linking to different communities seems to be incredibly wonky, even on a browser

Yeah I get the same thing. I use the search option like another person said, or I copy of into the Web app search bar and add it from there

Give it time. This app isn't even beta yet. It's got a ton of support though and they've been releasing updates a Lot.