I am using ringcentral-csharp. I have a very simple send SMS and initiate a RingOut methods that has worked fine with the sandbox. I got my production credentials and approval. When I switched to production the RingOut works fine (so the key and secret are good) but when I try to send an SMS I get the following error: RingCentral.Http.ApiException: The requested feature is not available.
Can anyone tell me what is happening here?