I tried to whitelist in AdGuard https://xxxx.xxxx.duckdns.org/ (my domain) or www.duckdns.org although the latest it is the one blocked in the top blocked domain is not being accepted.
I was able to whitelist https://duckdns.org/, but even this is still blocked.
@@||https://xxx.xxxx.duckdns.org^ is not working
@@||duckdns.org^ is working
in Custom filtering rules
@@||xxx.xxxx.duckdns.org^ is working
I guess it is solved!