Due to the nature of Smart Life and how manufacturers have coded their products it can become difficult for companies like Apilio to display all functionality from Smart life correctly so purchasing products can be hit an miss for completability, which hopefully will change with the new standard matter coming out next year. In the mean time all is not lost as @Anna says here New in Apilio: now with more Tuya devices supported!
Now Smart Life are working closely with Home Assistant compatibility issues will improve.
I’m sure if you use the web app and submit a request the team will take a look in case it is an easy fix @pebneter
Which Tuya Thermostat radiator valve did you go for?