Can't command Honeywell T6 t-stat to Away mode

Unfortunately the T6 Pro doesn’t allow you to configure or change away mode remotely. You can use this device handler to enable other advanced features like auto switch over, humidity reporting, deadband sync etc.

After integrating with SmartThings you can disable away mode and instead use SmartApps to change the schedule programming when you hub is in away mode or use motion sensors to control your thermostat with apps like these:

[RELEASE] 5-2 Day Programmable Thermostat Scheduler (Weekday, Weekend) with Remote Temperature Sensor for each Schedule

[RELEASE] Motion Sensor Thermostat with Remote temperature sensors, Presence detection and Schedules

[RELEASE] Mode Based Thermostat - Control Multiple Thermostats Temperature / Remote Temperature Sensors when Changing Modes

[RELEASE] Door Chimes and Notifications for Doorbells and Sensors

[RELEASE] Security System: Intruder Alert with Actions

[RELEASE] Unlimited customizable thermostat