Ask Vanguard to allowlist my account to be accessible outside US.
What to do about 2FA using phone number?
Update address.
Fill out W8-BEN form. (This is important and the customer representative might not know about it - but they support it and that’s what will decrease the tax deduction that they will do.)
May have to do this at other places too, such as Fidelity and Schwab.
Probably make Schwab as our primary bank account because of the fantastic international features on their debit cards.