Are you sure you need to report this interest? Since you didn't receive a 1099-INT, do you have a letter or other document stating you should report this each year? If so, a FEIN should be provided. Some interest only gets reported when bonds are redeemed.
If you're using TurboTax Online, clear your Cache and Cookies and retry entering your interest without a FEIN.
Here's more info on Interest Income Reporting from the Treasury Dept.
@Chasgid1950
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