Precision 7550 BIOS not recognizing WD SN770 2TB NVMe SSD

Precision 7550 specs state up to 2TB M.2 NVMe supported (Class 40), but only up to 1TB M.2 NVMe (Class 50).  However, it doesn't appear anyone outside of Dell uses those terms.  How can I get my 7550 to detect the SN770, or is this simply too good a drive for my (only 2 year old) 7550?  What other M.2 2TB NVMe options WOULD work?  Thanks in advance for any help/guidance!

(Note: Yes, the 7550 is PCIe 3.0 and the SN770 is PCIe 4.0, but should be downwards compatible so I can't see how that would be the issue.)