VPN with WR21. L@TP over IPSEC VPN server documentation is old and not working. Please help...

We followed the instructions from Application Note 21.

But it is just not working with Microsoft VPN. Currently using Verizon Network. Documentation is old and not current.

Has anyone made this device work as L2TP over Ipsec VPN server.

Just need one example to replicate it…

Getting frustrated here.