How do I reference UDT parameters in valued changed script

I have a value changed script for a tag within a UDT. I would like to reference the parameter {InstanceName} so that I can call in the name of the UDT to the script. I tried doing this with curly brackets but it didn't work. How might I do this? Thanks!

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From a valueChanged script, it should just be tag.name.

Note the parameters that are inherent to the function:

If it's a tag that is deeply nested within the UDT, and you need the root parent's instanceName, then you can parse the name out of the tagPath:

Example:

tagPath.split('/')[1]

Edit:
It could also be parsed form the backside of the path, in case the tag nesting level varies:
Example:

tagPath.split('/')[len(tagPath.split('/'))-2]
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I used tag['parameters']['InstanceName'] to get access to the InstanceName parameter.

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