Azure Virtual Desktop - Black Screens on logins - What we've tried so far

We use App Attach with Virtual Desktops and are seeing very similar issues, all of which started on Monday at approximately 2pm Central. When did this issue start for you? Your post, coupled with another below from Monday, suggest that there is an Azure-wide problem that is not specific to my environment or yours.

We are in the process of destroying and rebuilding our host pools and hosts, but it sounds like you've already gone through that exercise. We did switch to our failover environment yesterday, and it worked fine all day. But this morning, the same problem exists in that environment as well.

We've been engaged with Microsoft support since Monday and they have been absolutely no help at all.

Hoping you can post back here if/when your situation changes for the better!