406 "Not Acceptable" @ https://platform.devtest.ringcentral.com/restapi/v1.0/~/accountId/recording/{recordingId}/content

I am getting a 406 error when I try to get the call recording from the API @ https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/recording/recordingId/content ... The error says "Not Acceptable". My headers are set to 'accept: audio/mpeg' and I've also tried 'accept: audio/x-wav' both of them return the same error. In the RC Office API page @ https://developers.ringcentral.com/api-reference/Call-Recordings/listCallRecordingData when I try to do a test there it gives me the same exact error. Please help me figure out how to get my call recording information.