What is strange is that i can play Steam DayZ from the same network without any issue...

Seems that :

• From my smartphone as hotspot it works (without changing anything),

• From my home router it does not, even when changing DNS settings.

I never had any problem playing on my home router, either from my Switch 2 online or my desktop computer.

Can it be something about IPv6 ? Cause my ISP most likely use IPv6.