"errorCode": "RNG-102", "message": "Caller ID should be one of company direct numbers"

Hi Tyler, 
I am not using the extension number. I am putting the long number in e.164 format.
And I cannot post some code snippet as I am using your RingCentral Connect Platform API Explorer : https://developer.ringcentral.com/api-explorer/latest/index.html

I have created an application that is not yet in production and I am testing it using your API explorer platform. When making a ringout call through this app, it works perfectly when the calling ID is empty. When I put the 11 digits number in the calling ID field in E.164 format (for instance: +14445559999), then I get the error.

I see, I tried it too; it works with the number under the sandbox account. But why can't I put another numbers from my ringcentral account? is it because the app I'm working on is not in production yet? I am a bit confused as I don't recognize the number associated with my sandbox account.