When using the Samba Management plug-in for iManager to add Samba users to a Samba server, the users must already be assigned a Samba-qualified password policy.
If you try to add a user that does not have a Samba-qualified password policy, the following error is displayed: Could not Samba enable the user for group xxx. Received an error when checking for a universal password. Error: Cannot continue because the user does not appear to have a universal password.