Problems Accessing Admin Panel of KeyCloak

Good Day All

System-Information:
UCS Version: 5.0-10 errata1271
KeyCloak Version: 26.1.4-ucs2

I’m desperately trying to get the KeyCloak installed on our Test-Envirnomnet.

KeyCloak is successfully installed, also fully joined into the domain.

But, when i want to access the ucs-sso-ng.domain , only the Loadingscreen is shown:

If i then go into the Debug Editor… i see this in the console:

Does someone know, how to fix this?

Many thanks in advance for your help