COUNTIFS and INDIRECT Function

Hi all,

Because countif cannot be used across multiple tabs, I'm using the following workaround where "MySheets" is the range of tabs and E8 is the cell I want "counted".

=SUMPRODUCT(COUNTIF(INDIRECT("'"&MySheets&"'!E8"),"Fully implemented"))

This works perfectly, except that I really need COUNTIFS... I want Excel to count either "Fully implemented" or "Partially implemented" when in E8. I cannot get the formula to work and keep getting an error message. Can you help with the syntax?

=SUMPRODUCT(COUNTIFS(INDIRECT("'"&MySheets&"'!E8"),"Fully implemented",(INDIRECT("'"&MySheets&"'!E8"),"Partially implemented")))


Thank you!