Ecobee With Only 2 Wires

I currently have 2 wires coming from furnace. ecobee says: based on My heat-only system only has two or three wires connected to the Wires thermostat only ecobee transformer extra

Wiring ecobee with 2 wires in Y terminal : r/ecobee

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Ecobee only turns on if I manually do it. : ecobee

My heat-only system only has two or three wires connected to the

Found these two wires, could it be for the humidifier? : r/ecobee

Wiring ecobee with 2 wires in Y terminal : r/ecobee

I currently have 2 wires coming from furnace. Ecobee says: Based on

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