I recently bought an XPS 9510. I added a second 2TB NVME drive to the second slot. I can see it in the bios and in the Intel raid setup (control-i) It disappears within about a minute of booting into Windows 11. 

I tried going into the bios and putting the drives into ACHI mode but then Windows will not boot. (I guess Windows needs an ACHI driver installed that it is not finding?)

Any suggestions?