This is the formula I'm using
=SUMPRODUCT(--('This is my sheet name'!L:L=D2),--(NOT(ISBLANK('This is my sheet name'!A:A))))
The sheet name is variable and changes monthly, Its in a cell but I cannot use the cell as a string is there a way around this because there's too many of those around to replace monthly, I simply want to use a cell as a string in the example above, please help and thank you in advance.
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