Getting WPA supplicant to work from first boot

[nightswan120]

I'm attempting a headless install on my RPi Zero 2 W, but I'm having trouble connecting it to my Wi-Fi network. Here's what I tried:

I created and then set up /etc/wpa_supplicant/wpa_supplicant@wlan0.conf :
$this->bbcode_second_pass_code('', '
ctrl_interface=DIR=/var/run/wpa_supplicant
update_config=1
country = US


network={
ssid="wifi_network_name"
psk="wifi_password"
key_mgmt=WPA-PSK
}
')

Then, I created /usr/lib/systemd/system/wpa_supplicant@wlan0.service :
$this->bbcode_second_pass_code('', '
[Unit]
Description=WPA supplicant daemon (interface-specific version)
Requires=sys-subsystem-net-devices-wlan0.device
After=sys-subsystem-net-devices-wlan0.device
Before=network.target
Wants=network.target

[Service]
Type=simple
ExecStart=/usr/bin/wpa_supplicant -c /etc/wpa_supplicant@wlan0.conf -i wlan0 -D brcmfmac

[Install]
WantedBy=multi-user.target
')

Then to get WPA supplicant running at boot-up, I symlinked the service file to /etc/systemd/system/multi-user.target.wants, but my Pi isn't showing up on my network. Does anyone know what I might have done wrong?

[lategoodbye]

This is hard to say based on this little information. At first you should provide a dmesg so we can see if the wifi firmware has been successfully loaded.

[nightswan120]

I can't print a dmesg because I don't have a mini HDMI cable, hence why I'm trying to do the headless install. Might just end up having to buy a mini HDMI or ethernet to mini USB