disposable_email
Sign-up needs a permanent e-mail address; this one is from a throwaway e-mail service.
HTTP 400.
Likely cause: The address’s domain is on our list of disposable e-mail services.
What to do: Sign up with an e-mail address you keep, such as your work or personal address.
Retry: No. The same request gets the same answer; change something first.
Listed under Sign-in and organisations in Errors. Send the error’s requestId to support and we can find the request.