Getting error while trying to access protected routes from Postman

I’ve started using Auth0 recently. I’ve created an api using express and used Auth0 for user authentication. I’ve used Machine To Machine Application to get access token to validate the routes in unit test. It worked perfectly.
After that I tried to validate the routes from Postman. But for the protected routes (which uses checkJwt and checkScopes middleware) I am getting below error in Postman. I am not able to find what I am doing wrong here.

Error: getaddrinfo EAI_AGAIN undefined
at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:69:26)

Also I followed the steps from below article. Still the behavior is same.

Could anyone help me on this? Thanks in advance for your time and support.