Same here with Kubuntu 24.04. This is actually a bug of the system tray applet, one can connect via creating a WiFi-connection over the settings 'Network -> Connections'. See also here:
https://forum.manjaro.org/t/solved-workaround-cant-use-wpa3-sae- networks/110927 ** Tags added: noble -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1964100 Title: Cannot connect to open WLAN with 1.36.0-1ubuntu2 on Jammy To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1964100/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs