Connecting Navigator to Anaconda Cloud fails

Dear Community,

Connecting Anaconda Navigator to Anaconda Cloud fails: When I click Sign In in the Navigator, it takes me to the Anaconda Cloud authentication page in the browser, I can then successfully authenticate after entering my credentitals, but then the page times out with the following error message:

I am running Anaconda Navigator on a Windows 365 Cloud PC. Any help would be very much appreciated!