Using a named range in VBA code

I am trying to write a simply code to copy some formulas down to the last row of newly imported data. I have a UDF named Lastrow() that calculates the last row of the new data. The formula is in a cell named FinalRow.

I have tried numerous ways of referencing the value of FinalRow with no luck. Below is my latest attempt that hopefully is clear enough that it completes the idea that I am working on.

Sub CopyFormulas()

    Dim valFinalRow As Long
    valFinalRow = Range("Finalrow").Value
    ActiveSheet.Range("L2:M2").Copy Destination:=Range("l3:m" & valFinalRow)
    
End Sub

Any help is appreciated.