It's true many WD MyBook devices use encryption. But the MyBookLiveDuo NAS does not.
The two RAID member drives are in a Linux RAID format which Windows will not recognize. Absolutely do _not_ reformat.
This is from my notes on a similar MyBookLiveDuo remote recovery case I worked on in the past. It is the output of the Linux command "fsarchiver probe" and it shows the drives, partitions, and md devices where md127 is the data volume in Linux ext4 format. Also note this is a RAID1 setup. Yours may be RAID1 or RAID0.
[======DISK======] [=============NAME==============] [====SIZE====]
[sda ] [WDC WD30EZRX-00M ] [ 2.73 TB]
[sdb ] [WDC WD30EZRX-00M ] [ 2.73 TB]
[=====DEVICE=====] [==FILESYS==] [======LABEL======] [====SIZE====]
[sda1 ] [linux_raid_] [<unknown> ] [ 1.91 GB]
[sda2 ] [linux_raid_] [<unknown> ] [ 1.91 GB]
[sda3 ] [linux_raid_] [MyBookLiveDuo:2 ] [ 489.00 MB]
[sda4 ] [linux_raid_] [MyBookLiveDuo:3 ] [ 2.72 TB]
[sdb1 ] [linux_raid_] [<unknown> ] [ 1.91 GB]
[sdb2 ] [linux_raid_] [<unknown> ] [ 1.91 GB]
[sdb3 ] [linux_raid_] [MyBookLiveDuo:2 ] [ 489.00 MB]
[sdb4 ] [linux_raid_] [MyBookLiveDuo:3 ] [ 2.72 TB]
[md126 ] [swap ] [<unknown> ] [ 488.99 MB]
[md127 ] [ext4 ] [<unknown> ] [ 2.72 TB]
So recovery should be achievable from Linux. Or via RAID recovery software like R-Studio, UFSexplorer, DMDE.com etc.
Note for safety you may first want to make clone images. Also it may be that one of your drives is failing so you should review the SMART status.
If you get stuck or need help I'm happy to assist. NAS recovery is my specialty.