Comment # 26 on bug 1163771 from Freek de Kruijf

I tested Snapshot20200626 of Tumbleweed KDE and still wlan0 does NOT come up.
Before configuring wlan0 I disabled NetworkManager.service and checked if
wicked.service was enabled.
dmesg did not show anything related to wlan0 nor did journalctl -u wicked{,d}

I found the following lines in /var/log/wpa_supplicant.log, which might shed
some light:
1593607968.800601: wlan0: CTRL-EVENT-ASSOC-REJECT bssid=00:00:00:00:00:00
status_code=16
1593607968.801013: wlan0: CTRL-EVENT-SSID-TEMP-DISABLED id=0 ssid="FL42MBJ"
auth_failures=3 duration=30 reason=CONN_FAILED

I triple checked passphrase for this AP in /etc/sysconfig/network/ifcfg-wlan0.