Hi @Tarishah
Welcome to the community 
This issue primarily appears to be due to the proxy settings as the endpoint you are trying to access isn’t publicly accessible. Check if you are receiving the same issue for other requests as an example: Try sending the request - https://www.postman-echo.com/get
If you receive a successful response then, try changing the proxy settings and see if that helps. Here is the screen-record for your reference on the same.
Hope this helps! 