I've got two of these switches to test out and see if they can work in a hall where an upper and lower traditional two gang switch are currently installed. 

Trying to set up automation so that if the left gang on one switch is turned up, the left gang on the other switch goes on. If one is turned off, the corresponding one goes off etc to mimic the action of the two hard wired double pole mechanical switches. 

I can get it all to work fine except one of the S220 switches will not turn the other on. On either button. It'll turn the other switch(s) off as required, but not on. I've deleted and tried again several times, checked the firmware, and these devices were bought new a week ago so must be up there in terms of hardware. Still experimenting with conditions of the action to verify opposite switch status to try and get round the issue but that seems to cause other problems. 
 

 I'm wondering if the switch has an issue. 
Anyone any thoughts? 
 

Much appreciated. 

Ally