Finding matching Values in Column A and from those values highlight duplicates in another column

HelpmeExcel123

New Member
Joined
Oct 3, 2024
Messages
1
Office Version
  1. 365
Platform
  1. Windows
I need to locate all duplicate values within each set of ID numbers.
1727981063452.png
I know how to find duplicates in one column, but how can I base it on matching ID's over and over?
 

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Hello, I am not sure if I understand it correctly - is it supposed to be something like the following?

Excel Formula:
=COUNTIFS(A4:A42,A4:A42,B4:B42,B4:B42)
 
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