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I’m frustrated

LiftMaster 1246R installed with MyQ 888LM - getting slow blinking red and yellow lights

Just installed MyQ 888LM with my Lift Master 1246R. At first, I was getting the rapid blinking red and yellow lights, as the instruction states. Then I got slow blinking red and yellow lights. According to the manual, this means my 1246R is not compatible with the 888LM controller. However, the liftmaster website shows that this should be compatible.

Any tips on how can make this work would be appreciated!
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