FileVault2 commandline tool fdesetup is showing regression on High Sierra 10.13. We even tested on 10.13.3 beta2 with no success.
The command 'fdesetup usingrecoverykey' fails and gives output 'This command is not supported on APFS volumes'.
It used to return true/false until 10.13.
We use this command to determine if the system is unlocked using recovery key and force rotation of recovery key for better security.
Any idea if there is a change in command to identify this scenario. Also, can you suggest any workaround to find out if the system is unlocked using recovery key?