I heard about FabAccess now: Prototype Fund: "Heute Abend um 18 Uhr findet ein virtuelles Treff…" - Mastodon
Since the discussion came up before of how to manage access to rooms and tools, this could be a solution to try out.
I will document my findings here.
Documentation: https://fab-access.readthedocs.io/
There is an easy setup for the server: Install FabAccess — FabAccess documentation
There are apps: Get Client from Store — FabAccess documentation
The source code: FabAccess · GitLab
I have experimented with it and I could not get it to run. I will wait what happens from the created issue.