Hello everyone. 

This has been a common questions in this forum, and I've seen many people say that it's not possible to use the tapo temperature and humidity sensor as a trigger with alexa routines.  Well, it is now. 

All you have to do is open the tapo h100 hub on the tapo app (on your phone), click settings (upper right), then click "bind to matter" and follow the instructions. Also, make sure you have the latest hub firmware. It'll work like a charm. 

Temperature and humidity will show on the triggers list on alexa.