Re-set my router an unable to get plug to re-connecting to dot. I have two of these plugs and the other connected fine the other won't.
Remote control has to be enabled/working in order for Alexa to control the devices. If you were to disable the Wi-Fi on your phone, are you able to control both plugs?
If not, go into the device settings of the plug, and enable remote control.
If the one plug does work, tell Alexa to discover devices, it should then find the plug. If not, disable the Kasa skill in Alexa and re-enable it.