Last Friday I upgraded my Ecobee thermostat from a 4 to their new one. I removed it from the Ecobee app and it shows up no where in there. I have also reloaded several times but the old thermostat will not disappear.and there is no option to manually delete it. All I can do is disable it. All the room sensors are associated to the new thermostat, so that cannot be a factor.
I only have my three devices in use. The thermostat and the two switches…wish they did not discontinue them.