the problem came drom ipv6 configuration. I had to change my dns recaord to enter the correct ipv6 adress so I can ping succefully and acces the web interface
So I didn’t understood that ipv6 adress where directly connected to the internet. So I had to change the dns entries for my subdomains directly with their ipv6 adress on ovh. And set the main yunohost domain to its global ipv6 adress