turn on the DEBUG log in /etc/NetworkManager/NetworkManager.conf and restart NetworkManager.

[logging]

level=DEBUG

And, enable the debug logging in wpa supplicant. In /etc/systemd/system/multi-user.target.wants/wpa_supplicant.service, add the -dd option and restart the wpa_supplicant.

ExecStart=/usr/sbin/wpa_supplicant -u -dd