Problem to connect to Collabora

Hey there, I have a special problem. I installed CODE Collabra an connected it. The dot goes green, when I save the Collabrag URL in the NC App.

I can start files only, when I open them directly from the dashboard. When I try to start the same file from the directories it does not work. I cat an error message, that Collabra is not connected.

When I go back to the administration of the collabra app in NC the dot appears red.

Anyone with an Idea where the problem is?