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Didn't notice before but you used this:<uuid>Sample Device Template with TAG usage examples</uuid>and that's the name value, not the UUID for the template. Maybe second time you used the <name> tag?Good luck.Charlie
There's always a chance with AXL APIs that the error is not about the object you're requesting. Notice the error message:Item not valid: The specified null was not foundIt's not saying the UDT wasn't found. It does really say what was found at all.Fo...