I submitted IRS Form W-8. Why do I have to submit additional documentation?

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 before we can designate you as a non-U.S. taxpayer.

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I am an existing client. Why did I receive a request for additional documentation to support my tax status?
I was born in the United States but I do not have a U.S. passport and am not a U.S. taxpayer. Why am I being asked for additional documentation?
FATCA FAQs - Issues involving U.S. place of birth
FATCA FAQs - Issues Involving U.S. Green Card Holders