Running JSS 9.97.1488392992.
We have begun seeing an issue appearing on what appears to only be the new mid-2017 iMacs (iMac18,2) arriving lately (so far). After FileVault is turned on per our configuration profile, we attempt to add users other than the account that enabled FileVault. The users appear to be succesfully added, they are showing as a FV2 user in the JSS, they appear when you invoke fdesetup list. However they do not appear when the device is restarted on the FileVault preboot screen. In short, only the user that turned on FV2 is visible on the login screen.
Thus far we have attempted to remove them manually and re-add them, but this does not work. Creating new users from System Preferences or scripts and then adding them to FV2 shows the same behavior.
When the device is not enrolled in jamf, FileVault 2 appears to function correctly. So far this has been tested with 10.12.5 and 10.12.6 for these iMacs. We confirmed other hardware does not show the same problems when we follow our typical on-boarding workflow.