I am surprised by this. TT is not requiring a payer's EIN when I try a test file entering a 1099-INT, 1099-DIV, or 1099-B. In fact for interest and dividends the interview doesn't even ever ask.
How are you trying to enter the information. I'm not sure what you mean by the "same page" as your US investment income as there are different pages for interest, dividends, and capital gains.
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