What is wrong with this AND expression?

AND(ISBLANK([Delivered]),ISBLANK([Reason],ISNOTBLANK([Date])))

Error: ISBLANK function is used incorrectly

Expression works fine when I do not have the ISNOTBLANK([Date]) in it.

Your expression:

AND(ISBLANK([Delivered]),ISBLANK([Reason],ISNOTBLANK([Date])))

Probably what you want:

AND(ISBLANK([Delivered]),ISBLANK([Reason]),ISNOTBLANK([Date]))
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Ahaa… missing bracket lol

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