eWeLink-Remote Control Sync to iHost

Why can’t I sync devices with eWeLink-Remote Control with iHost? I have a sonoff m5, to which I added a sonoff r5 because iHost is out of range. And the scenes are set in ewelink and something in ihost. I thought ewelink wanted their devices to see each other, but I guess that’s not their priority. It really complicates the situation. Now I know that I won’t be able to sell devices from ewelink that are via eWeLink-Remote Control.

nothing? then it’s clear that I won’t install the ewelink remote control.