title: Google Cloud Pub/Sub - INVALID ARGUMENT error in Push subscription
body: <p>I created a topic &amp; then tried to create a Subscription with "Push" delivery type. When I use the domain <a href="https://www.omnea.com/push/google-handler" rel="noreferrer">https://www.omnea.com/push/google-handler</a> (the link doesn't exist), it works. However, when I use the url <a href="https://apidev2.omnea.org/push/google-handler" rel="noreferrer">https://apidev2.omnea.org/push/google-handler</a>, it throws INVALID_ARGUMENT error. </p>
  
  <p>Both have the same certificate authority. The only difference I see here is the domain &amp; sub-domain. </p>
  
  <p>Is there any other reason due to which I receive this error? </p>