I have the same problem. Maintaining a driver for specific PCI cards for many years, and could even submit new driver version to the Microsoft Hardware dashboard for attestation signing, but was recently locked out.
If I only try to open the "new hardware submission" dashboard page, I get a message "Access restricted".
After some discussion with Microsoft's AI agents, I could eventually open a support ticket, but even though the ticket mentions an "expected reaction of 8" (days, I suppose), there hasn't been a single reaction from Microsoft support for more than 3 weeks now.
If I only try to open the "new hardware submission" dashboard page, I get a message "Access restricted".
After some discussion with Microsoft's AI agents, I could eventually open a support ticket, but even though the ticket mentions an "expected reaction of 8" (days, I suppose), there hasn't been a single reaction from Microsoft support for more than 3 weeks now.