LMS does not include a TACACS+ or any other AAA server. It is strongly recommended that you do not install one along side the LMS server on the same logical server. The reason for this is that you do not want NMS maintenance to affect your network access. You also want to limit the number of potential attack vectors one could use to compromise your AAA server.
The leading recommendation is to put your AAA application on a dedicated physical server with strict physical and network access restricitions. If that is not possible, at least dedicate a virtual machine for AAA.