How to apply the dynv6 DDNS Server to DD-WRT?

In Google Chrome, it can work! The IPV4 can be updated.

In DD-WRT Url, it can connect to the sever but the ipaddress cannot be updated. I would like to know how to setup!

DYNDNS Server =
Username = password
Password = login = none
Hostname = Hostname

URL = /api/update?hostname=(HostName)&token=(UserName)&ipv4=auto


Error: 422