Get filter in Response

I am probably stuck on something very easy but can't get it to work.
I have a bunch of conditional statements in a stack and some of its branches have a final step that creates varibale “validation” with value “OK”.

Now I want my full function stack to return that “validation” variable value, but if that varibale doesn't exis I simply want to return “Not OK” value.

I thought Get filter is made for this, but I doesn't seem to work:

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