Hello @Qbsoon ,

Welcome to our community.

Once DDNS is set up correctly on your router, it should continue to function as long as the router maintains its connection to the TP-Link cloud and the DDNS service is active. However, for certain features and for managing DDNS settings, you may need to be logged in with your TP-Link account, not just the local password.

Verifying DDNS Operation:
• Confirm that your DDNS settings are correct by logging into the router's web management interface and going to Advanced > Network > Dynamic DNS.
• Use tools like "nslookup your_ddns_name" or "dig your_ddns_name" on your computer to check if the DDNS is resolving to your current public IP address.
• Make sure Port Forwarding is set up properly if you need to access a local server remotely.

For more detailed configuration and troubleshooting, please refer to these FAQs:
• DDNS setup: How to set up TP-LINK DDNS on TP-Link Wireless Router
• DDNS troubleshooting: Troubleshooting Guide of DDNS function on TP-Link Wi-Fi Router, LTE Gateway Router or Deco Router