Your phone skipped the WiFi sign-in
Something on this phone sent the sign-in to the internet instead of to the WiFi, so it could not finish. To fix it:
- Turn off any VPN or ad-blocker app.
- Set Private DNS to Automatic or Off (Android: Settings, Network, Private DNS). On iPhone, remove any DNS or VPN profile.
- Forget this WiFi network, join it again, and sign in.
Your account and any plan you bought are safe. If it still fails, ask the venue for help.