In the end, what is it you want in the cell, the final sum? I don't know that sheets is smart enough.. you may have to just wrap it all in a sum(), or maybe try to use an arrayFormula() to solve it.
You may be stuck summing each formula:
=sum(SUMPRODUCT(IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!B3:B"),IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!A3:A")=A3)*B3,
SUMPRODUCT(IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!B3:B"),IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!A3:A")=A4)*B4,
SUMPRODUCT(IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!B3:B"),IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!A3:A")=A5)*B5,
SUMPRODUCT(IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!B3:B"),IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!A3:A")=A6)*B6)
etc etc
Or see if this produces the result you want:
=ArrayFormula(SUMPRODUCT(IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!B3:B"),IMPORTRANGE("1SFj5DBJXqqSnITsqH2rdIG-WpgR4KIwX9j8yon-4sDo","CC'S!A3:A")={A3:A})*{B3:B})