Not authorized for device_id

Hi, I am creating a custom app for myself (NOT TO SELL). After reading the docs and asking questions here I was able to get the app running in the sandbox successfully. Since my tests were good, i bought a terminal to connect to it via the Terminal API. From my custom app, i can create a code and verify it. I see the terminal connected in my square account. When i try to use the API to create a checkout ( CreateTerminalCheckout, i get the following error:

{
  "errors": [
    {
      "code": "BAD_REQUEST",
      "detail": "Merchant not authorized for device_id=DEVICE_ID_HERE",
      "category": "INVALID_REQUEST_ERROR"
    }
  ]
}

Can someone point me to why I am getting this error. I believe as per the docs and the responses i got here, i do not need to request permission via OAUTH. Am i doing something wrong? Thank you.

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