Tado/Homekit stopped working

hi
yesterday i noticed my room felt cold and realised my radiators were cold. I looked and found that though my automations are running and the trv’s are showing that they are heating, they are not. The only thing I had changed was updating to 26.3, so ive loaded a backup back to 26.2.3 but they still are not working. They are integrated via the homekit integration and have been working fine.
This screenshot shows that they should be heating but as I say they aren’t.

my automations check the temps with seperate z2mqtt thermometers (xioami and sonoff) and as I say the automations are running and telling the trvs to ask for heat but the trvs are not responding.
any ideas?