Api Calling For Production Getting Authentication header value is malformed

Hi,

Currently I am getting Bad Request Error While testing Production Apps Called

RingCentralTOCouchbase ,I also See status as Production Key Activated

I had Followed the Steps by steps guide to test the API Call to get Proper Response

https://developer.ringcentral.com/library/tutorials/get-started.html

The Issues which I am Facing Now, is Even if I passes the Correct Credential I am Always get Bad Client

Can I got help to solve this Issues for us

please find the below attached Error ScreenShots for our test Api Call