How do I build a formula that looks for duplicates that also ignores blanks or "N/A"?

I'm trying to build a formula that counts if it finds a match so it will check a box but I don't want it to count blanks or when someone enters "N/A".


=(IF(COUNTIFS([Document ID #*]:[Document ID #*], [Document ID #*]@row) > 1, 1))


And no matter what I try I seem to break the formula.



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