Compatibility (or not) with Freebox

Hello,
After many ping pong test and communication with the devolo support for trying to run the CPL to replace my 1200+ Freeplug without success (can not synchronize the player and the Freebox Freebox server) i ended up buying another CPL devolo 550+ and now it works.
It seems clear that if you put 2 CPL 1200+ (1 on 1 on freebox server and player freebox) it does not work and synchronization between the freebox does not. As against the CPL is synchronized well together to actually relax its network but not allowing then to replace Freeplug (my initial goal).
By putting one against the CPL Freebox Server 1220+ and 550+ CPL 1 on freeboxplayer then ALL works and 2 freebox synchronize and Freeplug can then be completely replaced by Devolo CPL, significantly increasing the network flow between 2 freebox (server and player).
The 3rd CPL 1200+ WIFI can be useful into any decision to extend its wireless or LAN.

Here, it would be important that this inconsistency between CPL devolved 1200+ and freebox (in a set up or you want to replace the Freeplug by Devolo CPL) be better communicated