NETWORKDAY(S) not working for me


Hi - any idea why I am not able to get a formula NETWORKDAYS working? I've have below columns where due date and start date converted having formulas to get those dates. The formula is just "MID" combination and both columns are set to "date" format.

I tried using different ways of NETWORKDAY(S) but I am only getting #invaliddata as result.

Thanks for any hint here!


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