My Lpatop will not connect back the wireless HP printer, asking for security code, which it hasn't before

[jbw55553232]

How do I reconnect my laptop to my HP wireless printer, now asking for a network security key, which it hasn't done before as it was working fine prior to this message.

 

[hang-the-9]

Network security key as in your WiFi password? Did you try entering it? https://support.hp.com/hk-en/document/c03112291

Make sure the printer is connecting to your WiFi and not a neighbors.