@TP-Link any kind of device. It is random, after some retries it will connect. But this is not the best user experience. TP-Link wrote @RobsonT Hi, Which device did you try to set up the connection...

@TP-Link Sometimes, even when set, it does not respect the device preferred deco settings. I just have to turn off my device wifi and wait a few seconds before turn on, and see if it connects to...

@TP-Link upgrade just worked as expected! Finally I am able to select the signal source. Thanks! Just noticed sometimes mobile devices won't connect to nearest deco.