Make sure that, you use correct template id and auth. If you create the device under Template A for example, and when you use that device auth with Template B template id, it can be the problem.
I had a similar problem. I noticed that I used the wrong template id.
Make sure that, you use correct template id and auth. If you create the device under Template A for example, and when you use that device auth with Template B template id, it can be the problem.
I had a similar problem. I noticed that I used the wrong template id.