@EHM If the ping reply is OK then my-dnsname.tplinkdns.com binding is successful. How to login with local admin account:

@EHM Have you tried to ping my-dnsname.tplinkdns.com URL and see if the reply is from your router's WAN IP address (your public IP address) ? If it is, then the registration was successful. Logout...

@TKwsNi Well that's a perfect timing to test that - you can go ahead and upgrade your C50 FW to the latest FW release I posted in my previous post. Here's how to upgrade the router's FW (case 1).

@EHM Make sure that you're with the latest FW release for your device. In your user guide - Chapter 12.5 is described how to use Dynamic DNS feature of your router.

@TKwsNi Maybe the problem is with your DNS setup or the way Android OS devices communicate with this DNS. Many users are using a Pi-hole in their environment and configure the DNS in the router's...

@esmailelbob You can go through this story as an example on how to bridge your modem and build the PPPoE session from the router.