Can't join #room:libera.chat

[freijon]

I'm trying to join #<room>:libera.chat but it keeps failing. I keep getting errors on Matrix side like There was an error joining. or Failed to make_join via any server.

On the IRC side the user exists and joins the channel. If I use !join channel I even get an invitation by appservice but when I try to join I get the same error.

My server admin tells me all libera.chat rooms are impacted where no user from our homeserver has joined yet. Sounds like a federation issue?

Please help