Hello @Armin_Moesslacher,
Thanks for contacting us regarding this issue.
I am wondering if the airupnp package could be using the same ports as the Roon Bridge package and blocking discovery. There has been a similar issue with Emby (mentioned here) but I can’t say for sure this is the cause yet.
Would it be possible for you to share a few screenshots of this behavior?
Thanks,
Noris