How can I change the email associated with my account?

Changing an email address is not supported.

Alternatives

If you'd like to use a different email with Meta Model API, create a new account with the email address you'd like to use. Signing up creates a new account and its own team. For a business or enterprise, you can instead use a managed account with a work email.

If you need help moving billing or other settings to the new account, contact support.