It depends on whether or not you have built any credit history in the US that is associated with your ITIN and the length of that history. If you have a credit file older than six months in the U.S., you may be ineligible from using Nova Credit’s international credit report. However, with American Express US, you don’t need to overthink this as Amex will automatically check for a US credit file before redirecting you to Nova Credit (see the next question).