422 (Unprocessable Entity) fulfillment

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We are getting 422 (Unprocessable Entity) response when trying to upload tracking from our in-house app.


'x-request-id': '1047d55f-3a29-4967-8490-9a7e666670c2'

The order should be processable and the code follows the docs. 


I tried reach out to the support line, but they said it would need to be posted here. I've read through other responses, but not see the same issues with my implementation.