It has not been a special enable password set up for the user. This is required when you configure enable authentication. If you do not seeAdvanced TACACS+ Settings in the user options, select Interface Configuration > Advanced Configuration Options > Advanced TACACS+ Features and select that option in order to get the TACACS+ settings to appear in the user settings. Then select Max privilege for any AAA Client (this is usually 15) and enter the TACACS+ Enable Password that you want the user to have for enable.