To retrieve a saved Wi-Fi key from the command line:

; List Profiles
netsh wlan show profiles

; Get key for profile
netsh wlan show profiles <SID Name> key=clear

References:

• https://community.spiceworks.com/t/how-to-extract-wireless-network-info-from-registry-with-passwords/966143/11
• https://lazyadmin.nl/it/netsh-wlan-commands/#view-wireless-network-password