I also tried V3 and still the same issue : the router is able to go on the internet (I am able to ping facebook.com for example through luci) but when I connect my mac or my apple TV on the wifi of the router I am not able to go on the internet with my mac or my Apple TV (when they are connected on the wifi of the modem no issue obviously).

Edit : problem solved

I just updated my Apple TV and it’s working, it’s still not working on my mac but it does work with the mac of my girlfriend which is updated to the latest macOS version.

I have no idea what was the problem.

Thank you for your help !