Unique Count per Rep

[BeerBeer101]

good day and thanks in advance for the help. looking for a UNIQUE formula:

in D3, D4:
count unique clients per sales rep in a list as shown.

sales rep name (B) next to client name (A) - just count the unique.
i've tried several ways - can't make this one work.
appreciate the help!

 

[KRice]

one approach...

MrExcel_20220704.xlsx
	A	B	C	D
1
2	Client 1	Smith	Rep	Count Unique Clients
3	Client 2	Sam	Sam	3
4	Client 5	Smith	Smith	4
5	Client 3	Smith
6	Client 1	Smith
7	Client 4	Sam
8	Client 1	Sam
9	Client 2	Smith
10	Client 3	Smith
Sheet6

Cell Formulas
Range	Formula
C3:C4	C3	=UNIQUE(B3:B10)
D3:D4	D3	=COUNTA(UNIQUE(FILTER($A$2:$A$10,$B$2:$B$10=$C3)))
Dynamic array formulas.