The Fritz!box 7590 got the WPA 3 update a few days before
The only strange thing is that the Fritz!box sets WPA 3/WPA2 so a connection with wpa2 shouldn't be a problem, but it is
I've set the router back to wpa2 so I can connect again.
Thanks for your answer!
Yeah I personally own the 7490 and avm is a tad slow with 7.20 and I don't wanna give up my mods setup for a lab build