Your mobile device's location services are likely turned off, which blocks the setup software.
First, move your iPhone closer to the printer. Then, ensure both Bluetooth and Location Services are enabled on your iPhone before running HP Smart. The app needs both to locate your network and printer.
If that didn't work:
- The printer's Wi-Fi setup mode expired. Fix: Swipe down on the printer display, tap the gear > Network Setup > Restore Network Settings. Tap Yes. Wait a minute, then restart HP Smart.
- You're on a VPN. Disconnect from any VPN on your iPhone before running the HP Smart setup. Reconnect after.