Formula for Counting the Number of Unique Values in a Column but with multiple criteria

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Thanks.

If you have Excel 2021 or above, in G2 copied dow:

=COUNT(UNIQUE(FILTER($A$2:$A$9,($B$2:$B$9=E2)*($C$2:$C$9="Session"))))

SPILL version (for 365 or 2024):

=BYROW(E2:E3,LAMBDA(r,COUNT(UNIQUE(FILTER(A2:A9,(B2:B9=r)*(C2:C9="Session"))))))

G2=IF($E2<>"",SUM(IF(FREQUENCY(IF($B$2:$B$9=$E2,IF($C$2:$C$9=$C$2,MATCH($A$2:$A$9,$A$2:$A$9,0))),ROW($A$2:$A$9)-ROW($A$2)+1),1)),"")

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