Can't create an account

Oops! An error has occurred creating the account.
reject creation (PUT/me in incomplete state)

I am trying to create an account for the first time on ovh.com, as a private user. Not using VPN or any kind of blocking at all, just plain old Edge with all protections and blocking turned off on Windows 11.
I read that it could be an ip/location mismatch, but my ip does match my location. To be sure, I also tried creating an account through several different ip providers. No go. Anyone have a clue?