Are you sure that your “set” command syntax is correct?
Try to write “set ?” and you will see that “set” command has more fields to fill than you have entered.
you are missing a “sub-menu”…
it should be " /interface l2tp-server server " so as to see the server sub-menu. Imagine like going to interface → l2tp-server → server.
[aslint1@aslint] /interface l2tp-server server> set enabled=yes
as i can see you are trying to enable it as
[aslint1@aslint] /interface l2tp-server> set enabled=yes
all you have to do is write:
/interface l2tp-server server
set enabled=yes