DuckDNS Addon not working

Hei Guys, unfortunately the DuckDNS Addon stopped working. Seams like the cert is out of date but I do not know how to renew that.

Anyways the DuckDNS Addon sucks more and more. I never got it to work renewing the public ip.

Does anyone have this wokring 100% properly?

Is there an alternative?

Stack is RPi4 with Speedport.

VPN should be no alternatve.

Regards Manuel