Tag not monitored by Microsoft.
Thank you for the link! Since this is a Microsoft Learn lab, there are two places to get help for this:
Microsoft Learn support
https://learn.microsoft.com/en-us/learn/support/troubleshooting
This page has a bunch of troubleshooting solutions (although I didn't see "Lab access suspended" here) as well as the ability to get help by using the "Report feedback" option at the bottom. For your issue, I would select Product or functionality > Problems with the Sandbox > Feedback/Description/Screenshot.
Training support forums
https://trainingsupport.microsoft.com/en-us
This isn't the place to get your lab unlocked, but it is a good place to see if anyone else is running into the same issue and what they did to resolve it. In your case (Lab Access Suspended), it sounds like the solution is to reach out directly.