Tax Year Prior to 2020: For my 1099-INT, turbotax is asking for a FEIN, but my 1099-INT does not provide one. Is this essential or can I leave the FEIN blank?

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FEIN

A bank where I have a savings account (under $10 of interest in 2019, no 1099-INT mailed to me) provided me with the last four digits of its FEIN, preceded with five x's. I have had difficulty entering this information into TurboTax. Will I need to include it? 

Leave the FEIN box blank and continue. Don't attempt to enter anything in FEIN box.