How to copy RAID disks from WD My Cloud EX2 to another set of physical disks

I have been using WD Cloud Ex2 with 2 Wd RED 4T disks, in RAID 1 (mirror, right?) mode, and also using encryption on the volume.

I needed to duplicate these disks (long story… ), so I got identical set of WD 4T 2 disks, and used disk duplicator station to copy each of disk. I should , I thought , be quickest surest way to copy/move this RAID …

But when I plugged these new disks into same station, it does not pick up the RAID anymore: the drive leds are red, and it tells me no RAID detected (or smth) , and does not see my encrypted volume, so nothing to mount too.

I have tested these drives under my Linux workstation: I plugged them in, and sure enough my PC immediately picked the 4TB encrypted volume and after providing same password as I used to create it on my WD cloud, my PC mounted it fine and I’m able to browse all my files on that drive.

So what is wrong then with WD My Clound Ex2 not picking up / not liking my new physical disks? …

Please advise .

EDIT

Decided to enable SSH and look inside it .

Output from mdadm interaction below:

bash-4.2# mdadm --query /dev/sda1 
/dev/sda1: is not an md array
/dev/sda1: device 0 in 2 device active raid1 /dev/md0.  Use mdadm --examine for more detail.
bash-4.2# mdadm --query /dev/sdb  
sdb   sdb1  sdb2  sdb3  sdb4  
bash-4.2# mdadm --query /dev/sdb1 
/dev/sdb1: is not an md array
/dev/sdb1: device 1 in 2 device active raid1 /dev/md0.  Use mdadm --examine for more detail.
bash-4.2# mdadm --examine  /dev/sda1 
/dev/sda1:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 2ecef91d:f06b47cb:cdb3b3d2:42fc3e90
  Creation Time : Wed Jul 24 13:12:28 2019
     Raid Level : raid1
  Used Dev Size : 2097088 (2048.28 MiB 2147.42 MB)
     Array Size : 2097088 (2048.28 MiB 2147.42 MB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0

    Update Time : Wed Jul 24 13:13:18 2019
          State : clean
Internal Bitmap : present
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : 93a5fe18 - correct
         Events : 1


      Number   Major   Minor   RaidDevice State
this     0       8        1        0      active sync   /dev/sda1

   0     0       8        1        0      active sync   /dev/sda1
   1     1       8       17        1      active sync   /dev/sdb1
bash-4.2# mdadm --examine  /dev/sdb1 
sdb1
bash-4.2# mdadm --examine  /dev/sdb1 
/dev/sdb1:
          Magic : a92b4efc
        Version : 00.90.00
           UUID : 2ecef91d:f06b47cb:cdb3b3d2:42fc3e90
  Creation Time : Wed Jul 24 13:12:28 2019
     Raid Level : raid1
  Used Dev Size : 2097088 (2048.28 MiB 2147.42 MB)
     Array Size : 2097088 (2048.28 MiB 2147.42 MB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0

    Update Time : Wed Jul 24 13:13:18 2019
          State : clean
Internal Bitmap : present
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0
       Checksum : 93a5fe2a - correct
         Events : 1


      Number   Major   Minor   RaidDevice State
this     1       8       17        1      active sync   /dev/sdb1

   0     0       8        1        0      active sync   /dev/sda1
   1     1       8       17        1      active sync   /dev/sdb1

Doesn’t look like much trouble there … ? Perhaps I need to see if I can activate RAID manually …