@
doxIQI am testing authentication error cases.
And I understood your issue is bad client id case only.
BAD CLIENT ID
<oauth>
<error_description>
No client with requested id: 54006d52-6420-418b-90d0-999999999999
</error_description>
<error>unauthorized</error>
</oauth>
BAD CLIENT SECRET
<oauth>
<error_description>Bad client credentials</error_description>
<error>invalid_client</error>
</oauth>
BAD HOST NAME (call to Endpoint)
{"requestId":"9999#999999999999","success":false,"errors":[{"code":"600","message":"Access token not specified"}]}
But you succeeded "quick start guide" procedure.
Are you useing same client ID? or check client ID again.