I had a the same thing happen with a garage door opener sold on ebay. The buyer claimed the unit defective because they couldnt get the MyQ working. I responded pretty closely to the way you did and I never heard back from them. I hope all works out for you.
I had a hard time with the My Q at first. Had to get a cable and bring it closer to the opener and it paired instantly. Moved it back next to the modem and it has been fine since.
Buddy had to do the same. It doesn't like pairing at first if it's far from the opener.
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