Hi. 
I have a hub H100 and a sensor T100.

Both worked fine, but today I had to switch to a different wifi, and for that I've removed and readded the hub from my Tapo app. This also removed the sensor. 
Since that I couldn't manage to add the sensor so that it would appear in alexa too. The hub and the smart plug I have both appeared back in alexa. But no matter what i've tried, the sensor is not added back to alexa:

i've tried unlinking/linking tapo with alexa, resetting sensor and hub, reinstalling tapo app, doing all this in different order. 
what can I do to make it work?