I am a student in the U.S. and sent IB a copy of my F-1 visa but was told my response was insufficient to resolve the issue.

Please confirm that the proof of identity you submitted was issued by the treaty country and that the proof of address relates to your address in the treaty country. A proof of address document alone is not sufficient to resolve the matter. Sometimes, customers inadvertently submit documentation for the other address. Please check the date of the proof of address document. We can only accept documents dated less than 12 months old. Also confirm you submitted a proof of identity document from the treaty country…

In certain cases, the IRS Form W-8 you submitted is insufficient to establish your status as a non-U.S. taxpayer. This often occurs when certain U.S. connections are found to be associated with your account (e.g., U.S. mailing or permanent address, U.S. telephone number, U.S. place of birth, citizenship or Green Card).  The presence of these U.S. connections requires us to collect additional documentation …

You need to provide one document from Category A AND one document from Category B)(see below) AND  Category C a written explanation explaining the U.S. address or phone number:

Category A: Provide ANY ONE of the following documents issued by a non-U.S. country:…

In most cases, you automatically acquired U.S. citizenship when you were born in the United States even if you have never applied for a passport. U.S. tax rules designate all U.S. citizens as U.S. taxpayers, even those that did not live in the U.S. or receive a U.S. passport. U.S. citizens are required to provide us with IRS Form W-9 and a valid taxpayer ID (e.g. Social Security Number). Nevertheless, we may accept IRS Form W-8 from you to establish your status as a non-U.S. taxpayer if you provide us with a copy of your Certificate of Loss of Nationality of the United States (Form DS-4083) and a copy of your unexpired passport evidencing citizenship in another country…