First check
Open Device Health in the Ring app and confirm whether the device reports power and a Wi-Fi connection. Also check that the home network itself is online.
What to do
Power-cycle only the supported power source for your model, then retry the in-app reconnect/setup flow. Keep the phone near the doorbell during setup and use the network the model supports.
Done when
Device Health shows the doorbell online and Live View opens normally after the reconnect.
If it still fails
If the LED remains in the same state or setup never completes, identify the exact model and LED pattern in Ring’s support guide before using a reset procedure.