Answer to FileVault reporting Sealed Broken

Today I learned something that others may find valuable especially since it was hard to come by.

The disk encryption program FileVault reports that the System volume setting Sealed as Broken each time you login (or boot, not sure when but it uses your login password). It means that the seal is open, it is in use. Not fatally broken needing to be fixed. The concept being that once you open something that is sealed the seal is broken. Once you are done it will seal it back up again.

The FileVault encryption kicks in to protect the system should it be end up in the wrong hands. You cannot see it as not broken unless you mount it in another computer that can read Apple's file system APFS.

If you open a terminal and run 'diskutil apfs list' it will list all available drives and some of details about each. You will see it say:

Sealed: Broken

FileVault:                 No (Encrypted at rest)

Which means when you logout or shutdown the computer the system disk is not readable without your password.