My device can no longer connect to the Wi-Fi network, even though it was working fine before

Check that your cellular data is properly disabled.

Clear the browser cache.

Disable random MAC adresses

Try to forget the WiFi network then reconnect

Restart your device

Attempt to move within your location while staying connected.

Ensure you have no VPN or antivirus on your device (if you do, make sure they are disabled).

Try with another device

If it still doesn't work