I’m really not sure why the node is not working.
It expects Revit.Elements.Parameter and that is what I’m feeding it.
I’m inputting a list of parameters and it outputs a list of nulls. I’m really confused because the Parameter.SpecType node works as expected on the same list of parameters.
This is in Revit 2025 using Dynamo Core 3.3.0.6316 & Dynamo Revit 3.3.0.6523.
The graph is being used in a Revit Family. Let me know if you need more info.
Ooo, good idea! I didn’t try RevitLookup yet.
Yep, that was it! That however leads to another question but I’ll start a new post for it.
(How to create a family parameter that’s assigned to the “Other” GroupType?)
Never mind, I think I’ve figured it out. Basically if you wish to harvest a GroupType from family parameters do not create the parameters in the “Other” ParameterGroup. 
I wish I knew that years ago. I’ve created sooo many families where I put the parameters, I don’t want people messing with, in the Other group. Oh well, I learned something valuable today.
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