Here's the latest update: It was a mobo issue, Dell replaced it and now it POST with the Crucial 32gb DDR5 CT32G48C40S5. It does take a few minutes for the mobo to do a quick memory diagnostic on the RAM so be very patient with it.
Hi. Trying to upgrade my vostro 7620. Anyone know what compatible 32gig DDR5 works in this laptop? Crucial CT32G48C40S5 doesn't post on the laptop. Took it out, post just fine. I wore an esd strap and properly grounded when removed the RAM from the package and during install. 
Vostro 7620 ram