Yeah, iptables -L shows all the ufw chains
All right, then this is indeed not the problem 
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Right after following the HAProxy config:
https://github.com/nextcloud/all-in-one/blob/main/reverse-proxy.md#haproxy
and the modified docker run command : all-in-one/reverse-proxy.md at main · nextcloud/all-in-one · GitHub
It all worked. Thanks, @szaimen, for your guidance.
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