We have to consider a situation. If all physical interfaces do not have a link UP, the configuration of l2tpv3 cannot be configured. This part seems to be a problem with IP l2tp.
May 7 2019
Nov 8 2018
I have tested, the reason may be that your interface and the switch have not been UP. The route leading to the default route or L2TPV3 PEER address does not take effect. The ip l2tp command does not work.
This can be configured without any network cable. To configure L2TPV3, you will find that it is unable to commit.