For the device to be able to access incontrol2 it needs to be able to get to the *.peplink.com servers on the following ports UDP port 5246 and TCP port 443 and 5246. More info can be found here:
If you are sure that these are open and not being blocked by the service provider then I would suggest opening a support ticket with us and enabling RA on the device so that we can run some further tests: