Cannot set "Mark" parameter for doors

It might be a very silly mistake from me but for some reason I cannot set the Mark parameter for doors using this script.
I am capable of pushing the value I want to another parameter - tested it with the Comments field - but not with the Mark.

Any ideas?

Many thanks in advance
JDoor Numbers.dyn (35.0 KB)

What did it set the value to? It looks like it worked in the picture you provided.

It did not change the value on the Mark in spite of running w/o warnings.

From what I can tell it should be working. I have heard that some people have closed dynamo and Revit and then the value showed up. Not sure if you are running into this problem or not.

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i tested youre graph and Element.SetParameterByName worked just fine

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Will try that, thank you @Steven