Reactivating a Removed User
It is possible to reactivate a user that has been removed, by associating the user with an active license.
Note: If your site implements Access Control and group membership is automatic for a particular group, running an LDAP Sync automatically re-adds any reactivated users to the groups they belonged to.
If your site does NOT implement Access Control, or group membership is Manual or None, reactivated users are simply added to All Users, and must be manually re-added to the groups to which they should belong.
To activate a user
1 In the System Administration User management table, ensure that Show Removed Users has been checked.
2 Right-click the removed user that you want to activate. (Removed users appear with strikethrough login IDs and names.)
3 Click Activate.
4 From the drop-down menu, select the aPriori license that should be associated with this user, then click Ok.
5 Select File > Publish Changes from the System Administrator menu bar or click 
in the toolbar to display the Publish Changes window, then click Yes to publish your changes.
in the toolbar to display the Publish Changes window, then click Yes to publish your changes.