@Pol09
How Do I Detect WPS Pin HP Printer? 
A Wireless Network Password or PIN is strongly required to connect your printer to a local Wi-Fi network. Therefore, in order to establish wireless connections, you need to find a WPS Pin HP Printer which is a unique code containing 8 digits. Here’s the complete procedure to get this security code on your HP Printer: 
On your HP Printer Control Panel, press the “Wireless” button. 
The blue light will be flashing on your printer. 
Locate the “Wi-Fi Protected Setup” option and click on it. 
Search for the “WPS PIN” option and tap on it. 
Now, an 8-digit HP Printer Pin will be displayed on the screen of your printer