Thanks for the update and that’s correct. It’s a limitation of the current SmartThings API that’s used – the ‘extra’ authorizations are only available from the SmartThings mobile app.
So if you want to use the ‘extra’ authorizations, you have to manage your device selections from the SmartThings mobile app moving forward.
Reference: How To Authorize Unrecognized Things - #29 by josh
It sounds like the Ecobee integration dropped the ‘Thermostat’ capability and the ‘Temperature’ capability. From what you described, it sounds like what was showing under ‘Which Temperature Sensors’ might have been your Ecobee Smart Sensors rather than the thermostat itself. So it sounds like you might have to go through the ‘extra’ authorizations now.
Edit: James indicated that the Thermostat itself shows up under ‘Which temperature sensors’ but defaults to a Temperature Tile when added to your dashboard, so you have to manually change to the Thermostat layout (see 2 posts below).
@James do you still have your Ecobee connected to SmartThings and can you please confirm?