I think it’s something we can work around on the SharpTools side.
Looking back on my notes, you shared a screenshot of the capabilities and the issue is that the thermostat implements the individual Thermostat Heating Setpoint capability, but not the broader Thermostat capability.
This is basically telling us it only supports heating (eg. no cooling). Are you already part of the Beta group? If not, perhaps you could join and I can see if I can prioritize this for an upcoming beta.