AD user on encrypted MAC

using terminal:

sudo fdesetup add -usertoadd username -usertoadd username -keychain

and or:

1. Login as Local Admin
2. Add AD User to Filevault(you will need user to input AD Password)- Skip this step if you already added and rebooted and not seeing the AD User.
3. Log the Local Admin account out (Do not restart or shut down- just logout).
4. Now you should see the AD User(or Users list if multiple had signed in)
5. Login as AD USER. Then Log out(do not restart or shur down- just logout).
6. from the Login screen now reboot.
7. AD Users should now show up as an option to login in.

reference:

https://www.jamf.com/jamf-nation/discussions/25692/high-sierra-10-13-encrypted-users-not-showing-at-filevault-login-screen