Storage Space on RAID not available  

Windows 10 pro, just installed. Version 20H2. (Updates not yet started.)
Two RAID 1 arrays created in BIOS
MB: X570 AORUS Ultra, BIOS date Dec. 2019

I just installed Win10 Pro on the first RAID 1 (two M.2 drives). Windows cannot see the larger RAID 1 (SATA) I'd planned to use for data. Storage Spaces can see it and let me create a storage space on it, and it looks good there.

PROBLEM: Windows cannot see this array/storage space. Neither does it show in Disk Management.

Any ideas? Thanks!