#Invalid Operation with MATCH formula

=MATCH([Program Unique ID]@row, [Program Unique ID]:[Program Unique ID], 0)


I am trying to use this formula to return which row # the first match is in so that I can automatically mark the first one and differentiate it from following duplicates, but my formula is returning #invalid operation.

Open to ideas on how to fix this or other ways to get what I am looking for.

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