SIP Registration - JWT Auth error: "SPR-112 Client Edition is not compatible with current Brand"
After successfull JWT authorization for Client ID 5kbWr8Q48FFbdt4wl2f6q4 (Avaya Cloud Office - Sandbox - RingCentral Softphone Demo CSharp), the first Rest API call "SipProvision" fails w/ error message "SPR-112 Client Edition is not compatible with current Brand". The app setting is configured as "public" and NOT limited to brand "Avaya Cloud Office". As authorization method is JWT, I have no idea how to configure brandid 6010 inside C# program code. 
Please note: Auth via "Password" is no longer supported. Furthermore we're going to build a server-side app (Windows Service in C#), that's why rc.Authorize is called w/ JWT.
Client ID for this app in Avaya Cloud Office sandbox is: 5kbWr8Q48FFbdt4wl2f6q4
The app is configured as public w/o any limitation/restriction on specific brand.