Honeywell device not working with Smartthings

I have a Honeywell thermostat and cant get it to work with Smartthings app. None of my automatic routines work and I can’t change the thermostat from Smartthings. How do I fix this,

What’s the model number of the thermostat? And did it ever work with smartthings?

Honeywell Lyric T6 Pro Wifi

Not sure if this will help but just in case.

I have 3 Honeywell VisionPro 8000 Wi-Fi thermostats that were installed when we built the house in 2018. They are connected to the Honeywell Resideo app/service. The Resideo service is connected cloud-to-cloud with SmartThings. That makes the thermostats visible and controllable in the SmartThings app.

One annoyance is that the thermostats don’t seem to regularly refresh their state. And the Refresh command isn’t exposed in SmartThings automations (last time I checked). I ended up subscribing to SharpTools and creating a loop to refresh them every 30 minutes.