"I have a sandbox app that is validated and promoted to 'production' but I cannot seem to authorize the app using my Production credentials, can somebody help"Before we answer this question let's look at what differentiates a Public vs Private App in RingCentral :
Private if you are developing an app for your own RingCentral account use;
Public if you are developing an app for many RingCentral accounts.
PlatformType Server-Only (NO UI)
Dissatisfied customer 3 Answers