Can't get into same room with iOS SDK and PUN SDK

Hi,

We are trying to connect two users to the same room using Realtime: one of them from a native iOS app with Realtime SDK and the other one from a PC with Unity and PUN. They both connect to Realtime but they're are assigned different game servers. We have checked that App ID, App version and Lobby (null, default) are the same, and we have tried with both random join and specific room methods. What can we doing wrong? Aren't these two clients compatible?

Thanks