iOS 15.5 not connecting to School Public WiFi after Update

Home Screen > Settings > WiFi

Tap on the blue "i" next to the name of the WiFi network

Tap Forget This Network

Wait a minute, then try to log on to the network again. You may need to wait for a screen to appear with details about how to connect to the network

If the phone still won't connect.....

Home Screen > Settings > WiFi

Tap on the blue "i"

Turn off the setting for Private WiFi Address

Use captive Wi-Fi networks on your iPhone, iPad, or iPod touch - Apple Support

This is the only information that I can come up with.