To set up your DynDNS account used at INWX with a TP-Link device, set up the DynDNS account as follows:
Service Provider: User defined
Update URL: https://<user>:<passwd>@dyndns.inwx.com/nic/update?myip=<ip>
Username: Your DynDNS login
Password: Your DynDNS password
Domain name: Your DynDNS host name
Note: You do not have to replace the parameters for user and password in the update URL. This is done by the DynDNS service of the TP-Link router.