If my Cluster AG has the same URL as the URL of mobile application, would it cause any trouble?
Said, for example, the endpoints of the mobile app is on server X, which the URL is https://abcde.com.th:443
Then I have the Cluster AG (server Y) that is on URL https://abcde.com.th:443/e/5226f693-a9b4-4cf6-83df-701985a8a389
Would this cause trouble? The DNS are able to resolve abcde.com.th to both IP of server X and IP of server Y.
Cluster Active Gate is receiving incoming requests on port 9999. So theoretically it should work like this (if you have control on DNS configurations). But it this AG will have more functions in the future it will be good to consider new domain (to not do a mess with naming :))
You have to set the cluster activegate URL to the URL accessible from mobile devices. This heavily depends on your network architecture (load balancers / application gateways between cluster activegate and the client), so it's difficult to suggest a proper solution without knowing your environment.