@StephanS 

There are several (now hidden) threads about this issue. To find them, you have to select "within a week", not "all time".

So far NO response from TP-LINK/Kasa/Tapo! They are active here, answering mundane issues but ignoring critical issues like disappearing devices.

What is going on???

Is this still a topic no one is allowed to talk about?

https://community.tp-link.com/en/smart-home/forum/topic/667064

https://community.tp-link.com/en/smart-home/forum/topic/667000

https://community.tp-link.com/en/smart-home/forum/topic/667212

https://community.tp-link.com/en/smart-home/forum/topic/666554

  @StephanS I have exactly same issue, on my dads valves! Since an update to the app. I have tried the recent firmware update and today a tapo app update. Still nothing but the Hubs! Cannot even see them in add new device as an option!

If i login with the kasa app i can see the valves but not the hubs! annoying as all the plugs are tapo. I put all my dads stuff on tapo and mine are on kasa so i don't have to sign in and out of the app if i want to control his devices.

I don't want to repair 25 radiator vales and the explain to my dad , its kasa for heating and tapo for lights and camera.

Please sort TPlink!

I contacted TP link through the chat and they sent me a trial version of the Tapo app, and now everything works again. So clearly it's an issue with recent app updates

  @Johnpigg 

Version?

They sent me Tapo_Trial 3.3.513 and still no thermostats.