I wouldn’t hold your breath for that. They want players to attract their friends to their platforms. If we could play / talk to each other, there would be no reason for us to buy the games for their platform. I would really like it, but it’s less profit for them.
I had the same issue. i’m on Jerboa (android app). It’s not very intuitive. I ended up logging in via laptop web browser,and subscribing from there. If anybody has a clue how to subscribe to other communities via Jeboa, it’d be greatly appreciated.
You can create account on a per instance basis.
Cheers