Checking for agent availability - Conversation bot/Chat bot

Hi Everyone,

Im helping our CRM configuring there Conversation bot/Chat bot on Checking for agent availability. He provided a link to me as her guide on setting up. https://internalnote.com/a-full-guide-to-handling-agent-availability-in-zendesk-messaging/#checking-for-agent-availability

 

On article it said this the endpoint.
GET 'https://domain.zendesk.com/api/v2/agent_availabilities?filter[channel_status]=messaging%3Aonline'

 

But when i try it. Im receiving an Error 401 which is related to authentication.