Intune Server down? Can't install iOS profile.

I have to download a iOS profile for iOS Company Portal. But the server fef.msub01.manage.microsoft.com where the profile is located is down (Service Unavailable -
HTTP Error 503. The service is unavailable.)

EDIT: When I go to the URL my device shows me (https://fef.msub01.manage.microsoft.com/StatelessIOSEnrollmentService/DeviceEnrollment/ReportDeviceInfo2?client-request-id=REDACTED) I get 'Error 400'.

According to this list https://docs.microsoft.com/en-us/mem/intune/fundamentals/intune-endpoints the server is a valid endpoint for Intune. Neither the URL nor the IP-address is working.  

Where can I report this issue? And please don't say 'Support'. This channel is a - hmm - let's say, waste of time. The Health Portal says 'No issues'. Is there a Twitter account existing?

When is this URL back up again?