Try the following formula instead...

=INDEX(Tab1!A2:A1199,MATCH(1,(Tab1!B2:B1199=A3)*(T ab1!C2:C1199=B3),0))

....confirmed with CONTROL+SHIFT+ENTER, not just ENTER.

Hope this helps!

In article ,
"HJ" wrote:

I'm using the following sumproduct formula to look up two pieces on
information on a spreadsheet and then return the text that is in column A but
keep getting a #value! error. All the formatting is set to general so I'm
not sure what I am doing wrong. Any advice?

=sumproduct(('Tab1'!B2:B1199=A3)*('Tab1'!C2:C1199= B3)*('Tab1'!A2:A1199))