@GRL Thank you very much for your quick reply. They didn't tell me. Many thanks friend GRL wrote @Alberto0231 The TP-Link Cloud and DDNS service is down, i contacted support and they already know...

Hello friends. I have two TP-Link Archer C7 v5 routers with firmware 1.2.0 build 20211210 rel.51212 (4555) and I was registered with my TP-Link account and had a registered TP-Link DDNS domain name...