[anon8588]

ASP.NET behind Azure Frontdoor.

The only pattern I see consistently with such sign ups is that their name and email does not match if you read closely. I don't know enough about Azure Frontdoor functionality to be able to fix this myself.

[LinuxBender]

Unfortunately I have nothing to add to that but if you still have the option to edit your submission it may be worth adding those details to your original question.