How to use wps button on iPhone
How to use the wps button to connect Wi-Fi to iphone
iPhone 6s, iOS 15
User profile for user:
Community User
The iPhone's WiFi cannot be set up with the WPS button. This is primarily a function for equipment where it is not straightforward to enter the WiFi Password, e.g. Printers.
To connect to a WiFi network on your iPhone, go to: Settings > Wi-Fi
Find the network you want to connect to, tap and write (if necessary) the password.
You can find more useful information here:
Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support