Mine would not link - working fine and then stopped working.
I have the old Amazon/Alexa driver and while the license was there is was not making the screen show active. We copied it, removed it, then clicked on sET. Then pasted the license key back in and selected SET.
It came on line - the Alexa driver "skill" then synced easily and it has been working ever since.
Also had the LIFX driver become disconnected as well - this after updating to the 3.40 version of the Control4 software.
The cure for this was rebooting the controller.
The problem - it seems - was that the driver and the lights were being loaded in the reverse order that they should be loaded and rebooting sorted that out. Thank you Chowmain technical support!