External Web Service using OAUTH 2.0 Client Credentials

Summary:

Getting 401 error when connecting to external web service using OAUTH 2.0 Client Credentials

Content (required):

I am testing VBCS to connect to an external web service using OAUTH 2.0 Client Credentials. For my external webservice, I setup one in Google API.

I have tested my webservice using POSTMAN and was successfully did a call.

I am now setting it up in VBCS, however, I am having trouble

Setup(Supports CORS):

Result: error 401 Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.

It appears to me that the expected header