Thermostat tile can only do read-only?

Hi HA community!

I’ve got the thermostat tile setup on wear (Galaxy Watch 6 on One UI 8) and configured with a climate entity (ecobee thermostat). However, it only shows the current temperature of the thermostat and nothing else.

The official docs state that changing the target temp of the thermostat should be possible, but in my case, clicking the buttons doesn’t do anything. Also, the main temperature readout, which I assume is the target temp, only shows null values (see below).

Have I misconfigured something? Any suggestions appreciated. Thanks!