Mac mini FusionDrive - “No CoreStorage Logical Volume Groups Found” I can't figure out how to correct this at this point. I’m hoping someone here can point me in the correct direction.
I have posted my terminal outputs below for diskUtil list and diskUtil cs list.
@MacMini ~ % diskUtil list
/dev/disk0 (internal, physical):
   #:             TYPE NAME           SIZE     IDENTIFIER
   0:    GUID_partition_scheme             *121.3 GB   disk0
   1:             EFI EFI            209.7 MB   disk0s1
   2:          Apple_APFS Container disk2      121.1 GB   disk0s2

/dev/disk1 (internal, physical):
   #:             TYPE NAME           SIZE     IDENTIFIER
   0:    GUID_partition_scheme             *1.0 TB    disk1
   1:             EFI EFI            209.7 MB   disk1s1
   2:          Apple_APFS Container disk2      1000.0 GB  disk1s2

/dev/disk2 (synthesized):
   #:             TYPE NAME           SIZE     IDENTIFIER
   0:    APFS Container Scheme -            +1.1 TB    disk2
                  Physical Stores disk0s2, disk1s2
   1:         APFS Volume Macintosh HD - Data    58.4 GB   disk2s1
   2:         APFS Volume Preboot          83.2 MB   disk2s2
   3:         APFS Volume Recovery         528.8 MB   disk2s3
   4:         APFS Volume VM            3.2 GB    disk2s4
   5:         APFS Volume Macintosh HD       11.0 GB   disk2s5

/dev/disk3 (external, physical):
   #:             TYPE NAME           SIZE     IDENTIFIER
   0:    GUID_partition_scheme             *8.0 TB    disk3
   1:             EFI EFI            209.7 MB   disk3s1
   2:          Apple_HFS Adult Entertainment    2.0 TB    disk3s2
   3:          Apple_HFS Room4Activities      6.0 TB    disk3s3

@MacMini ~ % diskUtil cs list
No CoreStorage logical volume groups found
@MacMini ~ %
Once you're converted to APFS, CoreStorage is managed differently.
Your result for diskutil list correctly shows both internal physical drives &amp; the synthesised drive the OS constructs from that.
Note that both parts of what used to be called only from diskutil cs list both reference the same Apple_APFS Container disk2, which is correct, &amp; the construction is re-stated in the synthesized drive as Physical Stores disk0s2, disk1s2.
That it shows as Container disk2 rather than 1 means you have at some point re-formatted or reassigned, but that is of no import. Mine is up to Container disk7 on one drive these days.
diskutil cs list is now redundant.
There is a considerably more detailed explanation at The Eclectic Light Company - Fusion Drives in APFS