I have a very simple SMS program that works within the sandbox, but when I change the URLs (all predefined strings), Phone Number I get a valid access token but Status: 403: Forbidden "FeatureNotAvailabl. I've made sure everything is exactly the same as in the sandbox. It's all in VBA and there are only 3 places to change (Take out devtest from the URL for access token and posting of an SMS and the phone number of the account).