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888LM slow flashing on what should be a compatible opener

I just hooked up an 888LM to a Craftsman garage door opener that I believe should be compatible based on LiftMaster's chart (manufactured 4/98 with a red learn button) but I'm getting the slow flashing light / beeping that suggests it's not compatible. Any one have any luck with older craftsman openers? Model number is 41A5021-3C. Thanks

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