Hi @Niklas_Rohlfes and welcome to the forum.
You can change the display name for your core in Settings|Setup.
There is also a known authorization issue on QNAP Cores:
We’ve seen a few reports that, due to some recent changes in our latest update, some customers with QNAP Cores are needing to re-authorize their Core machine. If you see the Authorizations screen after updating, just choose the Unauthorize option and you’ll be able to continue using Roon like normal!
You have our apologies for the inconvenience. If you continue to see issues after doing this please open a new post in #support and our team will help you out as soon as possible.
Thanks!
Roon Su…
A fix has been provided. However you have to download and install it manually because the new version is still not available through the official app store:
I have put updates for the QNAP and Asustor NAS (which have been sent to QNAP App Center / Asustor App Central) on the roononnas.org website, for manual installation as long as they are not officially published.
It should fix the recurring authorization prompt after NAS reboot, introduced in Roon Server build 571.