The setup mode likely timed out. Restart it.
- Swipe down on the display to open the Dashboard.
- Touch the settings icon > Network Setup > Restore Network Settings. Touch Yes when prompted.
- Wait one minute. Close and reopen the HP Smart app, then try connecting again.
If that didn't work:
- Move your computer or phone closer to the printer. It might be out of Wi-Fi signal range.
- If you're using a VPN on your computer, disconnect from it before installing HP Smart. You can reconnect after setup.
Heads up: If your computer is connected by an Ethernet cable, you still need to turn on its Wi-Fi during printer setup. Don't unplug the Ethernet cable.