I've had an x55 for almost 3 years and decided to upgrade to the xe75.  Everything went fine in replacing the Main Deco and adding the new ones.  Everything on the main network which for this post I will call ABCNET connected just fine.  Less than half of the devices reconnected to the IoT network which I will call ABC_IoT.  Most of the devices on ABC_IoT are Tapo plugs which I had only occasional disconnects on the x55.  When I tried to reconnect one of the Tapo plugs I got a warning that I was connecting to an unsecure network.  I went ahead and said ok and it connected.  It was then that I went to my laptop and desktop just to see what the ABC_IoT network was showing and it said "open", no security.  I updated firmware, no change.  I rebooted, no change.  I turned off the IoT network, rebooted, turned on IoT, rebooted, no change.  btw - security on IoT is set to WPA/WPA2.  I also switched it to none and then back, no success.  I even renamed the IoT network to something completely different, I just can't get it to show as being secure.  What am I missing ?  For now, it is turned off and all of my plugs will just operate on their current schedules, I guess???