can't mount an encrypted Volume on an M1 Mac. Works fine on Intel Macs. Known Issue? Is this a known issue with M1 Macs and encrypted drives?
What steps should I attempt to mount this volume?
Encrypted drive will not mount on M1 Mac. Mounts on my intel Macs no problems.
It’s Extended (Journaled, Encrypted) format and I used Disk Utility to create the volume using standard Apple encryption.
It hangs DU when I ask DU to mount the volume, sometimes even just plugging it into the M1 Mac causes DU to hang.
On the rare times Finder asks for a password for the volume, it beachballs the Finder/Mac. When I try and mount it using DU or Terminal it doesn’t work, in DU it hangs DU and I have to force quit DU. Apple support senior advisor still cannot get to the bottom of it. Seems to be an M1 Mac and/or Big Sur issue. I’ve already allowed 3rd kernel extensions on this Mac so that’s not it.
This is not a Time Machine drive. (people often assume it might be). On the Intel Mac I can connected with a USB3 cable into a USB2 hub (older Mac) or via a OWC TB2 hub in one of the USB ports. ON the 13' M1 MBA I'm going directly into the USB3 port via an adapter (TB3 to USB/HDMI adapter). The M1 Mac can see the drive but not mount it from terminal, disk utilities or in Finder. If I ever get to the point of being able to enter the encryption key, it hangs the app doing it, or the Mac entirely.
  $ diskutil list external
/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *960.2 GB   disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:          Apple_CoreStorage magic-carpet            959.9 GB   disk2s2
   3:                 Apple_Boot Boot OS X               134.2 MB   disk2s3

/dev/disk3 (external, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS magic-carpet           +959.5 GB   disk3
                                 Logical Volume on disk2s2
                                 F37357F2-53C0-4926-BC59-431301F9A208
                                 Unlocked Encrypted

/dev/disk4 (disk image):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     Apple_partition_scheme                        +49.1 MB    disk4
   1:        Apple_partition_map                         32.3 KB    disk4s1
   2:                  Apple_HFS AnyMP4 Screen Record... 49.1 MB    disk4s2
There's no known, general issue with encrypted drives for the M1 Mac.
The symptoms you're describing sound very much like a corrupted file system. Together with bugs in the operating system's file system code, it can lead to these issues. I would run a file system check on the drive when unmounted. You can do this from your Intel Mac.
You can run the file system check from the Terminal like this:
sudo fsck_hfs -f /dev/disk3

Note that this assumes the file system is HFS+ and that it is mounted as /dev/disk3 (as in your screenshot). Use Disk Utility first to find the actual disk number.
The problem could also be of a hardware nature. I would suggest trying to connect the disk using the exact same adapter to another PC/Mac and see if that works. As you're using different methods of connecting the disk currently, it is difficult to know if it could be a hardware issue or not.