Dynamic data, COUNTIFS formula value 0 [closed]

I have started creating my first dinamic report, but I bumped into some problems.

I have a source sheet with project group data in Column Z and month-year data in Column AO. My goal is to generate a report table that displays the count of product types for each unique project group and month-year combination.

Steps Taken:

1. I've successfully extracted unique project groups in Column A:

=UNIQUE(IMPORTRANGE("URL", "Form Responses 1!Z2:Z")))

2. I've obtained unique month-year combinations in Column B:

=UNIQUE(ARRAYFORMULA(TEXT(IMPORTRANGE("URL", "Form Responses 1!AO2:AO"),"MMMM YYYY")))

The issue is, however, when I attempt to calculate the counts using the formula

=COUNTIFS(  IMPORTRANGE("URL", "Form Responses 1!Z:Z"),$A2,  IMPORTRANGE("URL", "Form Responses 1!AO:AO"),     TEXT(B$1, "MMMM YYYY"))

The resulting count is consistently 0.