Our users use the RC Phone app (the soft phone). It is installed on each desktop. We have a .NET app that currently uses the password flow to auth:

await restClient.Authorize(Username, Extension, Password);

The app uses CallOut to make calls:

await restClient.Restapi().Account().Telephony().CallOut().Post(makeCallOutRequest);

This method inits the soft phone to make the call. If the user needs to navigate a phone tree, they can use the numpad on the soft phone. We have to switch to JWT flow before March, so I created a new app and a JWT token to auth using JWT. I switched the client ID and client secret from the password flow app to the JWT flow app and can successfully authenticate:

await restClient.Authorize(rcJwtToken);

The problem is that I am no longer able to make calls, as I keep getting "CMN-102", which indicates a "Resource for parameter [deviceId] is not found". The only things I changed are the client secret, client ID, and line to use the JWT token. The exception is thrown at this line:

await restClient.Restapi().Account().Telephony().CallOut().Post(parameters);

How can I get this working? Thanks!