We used to image machines, but now it is not possible to activate Filevault through JAMF because there is no security token existing on machine.
If I create a local account it get the security token and I should then be able to assign the token to the current user of the machine. Does there exist any script on that as to do this on 100 machines manually would not be the best
You may want to peruse this thread: https://www.jamf.com/jamf-nation/discussions/27209/script-to-assign-a-secure-token-and-add-user-to-fv2
Also, here is a good overview explaining Secure Tokens and FV from Rich Trouton's Der Flounder site: https://derflounder.wordpress.com/2018/01/20/secure-token-and-filevault-on-apple-file-system/#more-9561
A lot of folks are struggling to find a good solution for this same need.
Good Luck to you.
we too are experiencing this issue, we had a script which passed the security token to our jamf admin account. that is no longer working since 10.4.1 was release. haven't found a solution for this yet but theres a pretty details workaround you have here - https://travellingtechguy.eu/macos-mojave-secure-tokens/