What shows up without any intervention from myself is the following:

I AM however able to connect to the PR server manually. When I do this the server prompts me that my username is invalid and that I should change it. I have to do this everytime I try to join the PR server. After changing my username and connecting manually, mumble works perfectly fine.
I personally think the message of my username being invalid may be related to Mumble not auto-connecting, I could be wrong though. I have unfortunately not found a way to change this username permanently, so I haven't been able to check whether Mumble does manage to auto-connect with another username.


