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I don’t believe there is a reverse switch on a Mdrive like on the traditional manual transmissions. Being the truck is a 2020 it has a light control module (LCM)  that gets a signal from the either the gear selector or transmission ECM  to send voltage from the LCM to the reverse lights. Check all the LCM fuses in the fuse box on top of the dash , I believe there are at least 5 and possibly as many as 7 LCM fuses. 

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