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The attempted conversion is failing. Does anyone know why?

Disk Utility.app error:

Converting “mySSD” to APFS

Converting HFS Volume to an APFS Container which will export one APFS Volume
The target is the Journaled HFS+ volume “mySSD” on disk3 backed via CoreStorage on disk2s2
The target is a data disk; it is not a macOS system disk
Found APFS EFI driver /usr/standalone/i386/apfs.efi to install into the APFS Container
Saving encryption context
The target is encrypted
Unmounting disk3
Exiting conversion operations with error code -69888
The operation couldn’t be completed. (com.apple.DiskManagement error -69888.)

Operation failed…

Environment and disk details:

$ sw_vers
ProductName:    Mac OS X
ProductVersion: 10.14.6
BuildVersion:   18G84
$ diskutil list
[...]
/dev/disk3 (external, virtual):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS mySSD                  +499.1 GB   disk3
                                 Logical Volume on disk2s2
                                 BCFD2F21-6361-4256-AF3A-ACB4D78D7669
                                 Unlocked Encrypted

$
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  • google.com searching for com.apple.DiskManagement error -69888 thus far produces nothing useful. :-/ – Johnny Utahh Sep 11 '19 at 17:09

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