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by majewsky 3447 days ago
systemd-networkd doesn't know about wpa_supplicant. You would start wpa_supplicant@wlan0.service and see wpa_supplicant errors there.

networkd only springs into action when wpa_supplicant succeeds in establishing the layer 2 connection and the interface becomes UP. I like the wpa_supplicant+networkd combo precisely because of this decoupling between network layers. One day, I'll get off my lazy ass and replace NetworkManager by wpa_supplicant+networkd on my notebook.