Error joining an external server

When I add a server in mcpe it says locating server, but it stays like that always. So I tried joining the server even though it says that and it says unable to connect. I've been trying it so many times and I have checked my internet a million times even though it's fine. It will be very helpful if you fixed it.
Responding to LateLag: the ip isn’t play.lemondcloud. the ip is play.lemonscloud.org