To clarify for others having the same issue, the “portal” @ringo is referring to is a lobby. Here, you can request an invite into the main EndeavourOS room, once the admins are satisfied you’re not a bot.
So the sequence for me was:
- Open my Matrix client.
- Open this link in my web browser: https://matrix.to/#/%23Endeavouros:matrix.org
- Hit “Continue”, then find your app (Element in my case) and hit “Continue” again.
- The EndeavourOS “portal” (lobby) will load in your Matrix client and you should be able to join it.
- Ask there for an invitation into the main EndeavourOS room. An invitation will be sent to you from the main EndeavourOS room in the Matrix client.