transmission not engage

I have a 2019 SCAB and could not get the truck to move when in any gear. This is the 2nd time this has happened. Curious if this has happened to anyone or if there is something related to the tailgate? Sequence of events: Unlock truck via fob Open tailgate via trunk release on tailgate Load...

So, I stopped for maybe 20 minutes (truck off). When I went to leave the truck may have engaged in reverse hard to tell was on a slight hill, but when placed in "D" all engine, not moving, tried all gears, still not moving. Quick search on line had a transmission reset procedure. All off, key...