You could conditionally format the second dropdown to turn red if it needs to be updated.
What versions of Excel are others using that your macro doesn't work for them?
Anyway, here's an example. with the first dropdown in A1 and the second (dependent) dropdown in B1, I set this Conditional Formatting
=ISERROR(VLOOKUP($B$1, INDIRECT($A$1),1,FALSE))
So if it can't find the value in B1 on the list in A1, it will change color.
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