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My switch MSS570 does not work. All brightness LEDs are flashing, and I cannot turn the lights on and off.

This means that you have connected Traveler-1 from the master switch to Traveler-2 of the add-on switch. Switching the wiring positions of T1 and T2 on the add-on switch will resolve this issue.

You can also refer to this installation video to check the wiring again.

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