I've been trying to use Matrix to replace sites like Discord or Slack. But it seems that if a user creates an invitation-only room in a server, then invited users who are registered on other servers get errors when trying to join. Not very useful error messages either: "Failed to join room". (In my case, I tried creating accounts and rooms at nitro.chat and then at converser.eu, but friends registered at matrix.org don't manage to join).
Quite a let-down. Anyone who's facing the same problem and has maybe managed to solve it?
In my experience it looks like a case of matrix clients not doing a good job of communicating that things happening in the background haven't finished yet, and throwing generic error messages (a bit like lemmy-ui does sometimes).
I've been able to join invite-only rooms on other instances - it said 'failed' at first, but when I went back later it turned out that I had actually joined.
What are some of the popular Matrix clients that you've seen have this problem? And are they open source?
I've been curious about Matrix for a while as a potential Discord replacement, but haven't actually tried it. Might be interesting to check it out and see whether I can contribute to one of the clients somehow.