Identify First Occurrence of a Purchase

Would like to identify the first occurrence by date
that a customer purchases product 2 in the attached
table. Would prefer that the target column be populated
with the first purchase date. Thank you for your help!

Try this, copied down...
=IF(COUNTIFS($A$9:A9,A9,$B$9:B9,2)=1,C9,"")

To make it more flexible, replace the 2 with a cell ref, then enter 2 (or whatever number you want) in that ce//

Try in array formula in D9:

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...confirmed by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL+SHIFT+ENTER you will get an error or a clearly incorrect answer. Press F2 on that cell and try again.
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