Update: overnight Arianespace press release
The launcher’s liftoff took place on January 25, 2018 at 7:20 pm. A few seconds after ignition of the upper stage, the second tracking station located in Natal, Brazil, did not acquire the launcher telemetry. This lack of telemetry lasted throughout the rest of powered flight. Subsequently, both satellites were confirmed separated, acquired and they are on orbit. SES-14 and Al Yah 3 are communicating with their respective control centers. Both missions are continuing.
Note they are very careful not to say that the satellites are in the correct orbits. As far as I can tell from a quick look at the spaceflight forums, the exact positions of the birds is currently not known so its quite possible the two birds are rather lower than intended