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Im getting error 415 Unsupported Media Type when sending SMS with sandbox app

APP ID VRbX8zVSRVeOvf0SoKM_1Q

I know my credentials are correct because I can 'GET' the messages I sent using the "try it out"
this is the body of the Json request

{

  "to": [{"phoneNumber": "+15555552586"}],

  "from": {"phoneNumber": "+15555552434"},

  "text": "The ARG is blank"

}

I am using the correct number and extension.
here is the header of the last request

{

  Server: nginx

  Date: Mon, 17 Jan 2022 02:21:20 GMT

  Connection: keep-alive

  RCRequestId: 2865d8f2-773c-11ec-84a0-005056bb9f38

  RoutingKey: SJC12P01PAS02

  X-Rate-Limit-Group: medium

  X-Rate-Limit-Limit: 40

  X-Rate-Limit-Remaining: 39

  X-Rate-Limit-Window: 60

  Content-Type: application/json; charset=utf-8

  Content-Length: 60

  Content-Language: en-US

}

thanks for any and all help

Based on your app analytics, I see you have 2 successful /sms POST calls, and other calls failed with 400, 401 and 513. Can you check and compare what did you change in your code that caused the failure?screen-shot-2022-01-17-at-81728-am.png

as far as I can tell, I never got a successful post. can those success posts be the 'try it out' posts?

Then again, I believe that it's your PowerShell code that could convert the data in wrong format. Can you remove the plus sign from the number and try again.

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