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Why isn't the dimmer switching correctly at both locations?
In most cases there is 2 reasons for this. The dimmer needs to be programmed or the standard 3 way switch needs rewired.
For the dimmer programming refer to the section of the instructions that shows 2 fingers pushing on the Maestro.
For the modified wiring of the standard 3 way switch refer to section 5b of the instructions.
Instructions are attached to this post.