I've used the Tp-Link smart plugs for a number of years. Other than the first batch that died and TP-Link politely turned their back on those who owned them, the others have been reliable for us. I have a number of them set up in the app and then linked to Alexa throught the Alexa app.

Recently, I booted up the Kasa app and it asked me to add a device, as there were none there. I checked I was logged in and I was. I logged out and in again, same deal. No devices had been remembered. 

I went to the Alexa app and they are all still there and not only that, I can turn them on and off from the Alexa app so they are actually working. Why then does the Kasa app not know what they are if they are actually registered and working?

Smart home stuff is fun and functional, until it doesn't work and to be honest, this is just annoying to say the least. How can they work but Kasa doesn't know what they are and more to the point, think we don't have any devices.

App deleted and re-installed. Logged in and out etc etc. We have a ton of these devices and to re-connect them all and then set up all the routines and stuff in Alexa is hours and hours of work. Any ideas anyone?