When you enable a user account, the user can authenticate and access protected resources.
To authenticate users to a directory server, you must enable the user in both the directory server and in the Security Console. Only users who are enabled in the directory server can authenticate to the directory server.
In the Security Console, click Identity > Users > Manage Existing.
Use the search fields to find the user that you want to enable. Some fields are case sensitive.
Click the user that you want to enable, and select Edit.
Under Account Information, clear Account is disabled.