Did you figure it out ?Do you have another storage device connected?
I have the original HDD C: drive with Win10 on it, I've tried using Windows Admin tools to access the drive, as well as disconnecting the HDD and booting from a Windows Installation USB stick (which was my intention with the new SSD anyway to get a clean install). Neither method would recognize the NVMe as a drive, only as a "device" in Device Manager, which says it is working properly. So I'm at a loss...