I have an app that injects tickets into our on-prem system, this works flawlessly.  I tried doing the same with a ticket note, example appears solid, it works from the little tester on the webpage.  However when I do it from my app, or AdvancedREST that I use for testing, it fails stating the Technician key is invalid, but it is the same key that worked 30 seconds before to open the ticket through the API. 

Am I missing something?