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THIRDREALITY Smart Switch MT1, Matter Over Thread, Retrofit for Toggle/Rocker Switches, No Wiring Needed, Requires Thread Border Router, Works with Apple, SmartThings, Google, Home Assistant

THIRDREALITY Smart Switch MT1, Matter Over Thread, Retrofit for Toggle/Rocker Switches, No Wiring Needed, Requires Thread Border Router, Works with Apple, SmartThings, Google, Home Assistant
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comments:

darthnsupreme posted on r/homeassistant2w

This should always be the first assumption when only two wired plus ground are present. OP's workarounds are either a Shelly (or similar) relay installed behind the light fixture or some manner of actuator to flip the existing dumb switch for you.