We are getting this same issue.  Somehow two days ago two of our users got set to "Inactive".  We've tried the scripts mentioned in the API but they will not reactivate.

We also even got our Azure Owner to run the scripts and generate a pat to try, and it doesn't work for them either.

There needs to be a better way to reactivate users, and there should be some kind of confirmation to deactivate them as no one in our org knows how these two users got set to inactive.