Google Sheets - Conditional Formatting Format Cell Color compare to another column cell value

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I was trying to change the cell color if the cell value doesn't in the list of another column using the Conditional Formatting but my formula is wrong so it wouldn't change the color. The formula I had tried:

=AC3:AC<0

Desired Output:

enter image description here

1 Answers

Try below formula in CF rules.

=IF($A3<>"",NOT(ISNUMBER(MATCH($A3,$C$3:$C,0))),"")

enter image description here

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