I work in a similar environment with mobile accounts. Try using this to
add the user in question to FileVault. sudo fdesetup add -usertoadd
username (Replace username with the mobile account username)Enter the
user name: 'adminusername'Enter the pass...
I just spent a bit of time on this today and confirmed a few things with
Jamf. There is no way to actually block macOS Betas through Software
Update. You can defer all updates for up to 90 days which will prevent
users from being able to install it t...