Please check if the address specified to Connect To Room Server matches the address of the room server that was received from a Search function.
After connecting to the master server, when you call the Connect To Room Server function to connect to the room server, if you mistakenly specify the address (a host name or an IP address and a port number) of the master server instead of the room server, it may cause the success callback to be executed apparently indicating a successful connection but succeeding API that uses room server functions to become irresponsive. (In fact, the failure callback will be executed after about 30 seconds due to a timeout.)