Have a Liftmaster Professional 1/2 hp non-wifi opener with purple learn button. Set up hub and sensor. Press purple button and release immediately, learn light stays on for a little while and goes out, light on opener blinks twice, a bit later the door opens and closes. Then I get an app message that the opener and hub haven't paired. What the heck was the light blink and door opening and closing if not paired? Tried setup a couple times, followed same process with same result. Help me! TIA.
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