Can't sign up for Vercel, like at all

I go to Vercel and try to sign up with my email. (No I do not want to use another method, tyvm.)

I get: Please try again or try a different sign up method. If you continue to have issues, please complete the account recovery form for further assistance.

So I try this account recovery form thing and then that form tells me: We had an issue processing your appeal [???]. Try again later.

I've never had a Vercel account with the email address I'm trying to use.

While I wait to hear back from them (the only option was to email their billing@ address), anyone know why all this might be happening?