You are welcome Those bays are all in pair, each row share a single pcb with the hotplug connectors. As a consequence if the nvme kit is ordered during configuration (purchase) or if is manually swapped in later, it always affects both bays. This adapter [URL] is a 3rd party quality known working adapter that could be installed in the bay of the failed drive, to use a standard nvme ssd. 
I have two Precision 5820 workstations. However, the one that is now out of warranty has developed what appears to be a hardware fault. One of the hard drive carriers has a status light that flashes amber all the time. On the face of it this means a faulty disk.It's the one at top left alongside the 1TB NVMe C: drive However, I can put a brand new disk in and it still flashes. Move a carrier from one of the other slots into it and it still flashes. Move a working disk from another slot into the original carrier and it still flashes.So it would appear there is a fault internally? With no disk in the carrier there are no LEDs illuminated. Anyone have any ideas please? Tony
Dell Precision 5820 Disk Drive Caddy Fault