Hello @TobiasFrank ,
This is definitely not working as intended here, then. I'll get a ticket submitted for our developers to fix this issue.
The console log for ap.meraki.com is testing if we can reach the local status page of the device (we use this to provide a button that takes you to the LSP). The 500 error, though, is more interesting and may be related to the issue. The "network" tab may show the offending request that was made and help us dive a bit deeper.
There are still two methods that should be available to contact support:
1. Use the settings menu directly to open a case, and not the "Contact support" button in the troubleshooting flow.
2. Try using the mobile app both the way you've described to reproduce the issue, but also using the settings menu directly.
If you still face problems opening a case using these steps, let me know so we can take a peek and hopefully fix whatever issue it is you are bumping into.