Insufficient Permissions to create Company Greeting

Hello, so I'm trying to create a company greeting using the provided API with Python and I'm getting back this error using this endpoint:

 https://platform.devtest.ringcentral.com/restapi/v1.0/account/accountId/greeting 

{
  "errorCode": "InsufficientPermissions",
  "message": "In order to call this API endpoint, application needs to have [EditAccounts] permission",
  "errors": [
    {
      "errorCode": "CMN-401",
      "message": "In order to call this API endpoint, application needs to have [EditAccounts] permission",
      "permissionName": "EditAccounts"
    }
  ],
  "permissionName": "EditAccounts"
}

And I also tried putting a request using the browser with no luck.

I checked the permissions for my sandbox application and all the available permissions are checked, this is my sandbox account number +18024488966. Any suggestions, and or solutions? Thanks.