Problem installing Nuki

Hi,

I just installed the new Nuki smart lock ultra. Everything works fine, but now I want to get it in Home Assistant.

I activated wifi, linked it with Google…works fine.

Now the Nuki integration…

I created a Token on the Nuki website :

But when trying to add the integration, I get this error :

Local :

DuckDNS :

What am I missing ?