Firebase Cloud Messaging - Target to single device not visible in Firebase console

Try These Steps Carefully:

1. Tap New Notification

2. Fill up Notification title(Optional), Notification Text, Notification label(Optional) and etc

3. Tap Send Test Message under 1. Notification

4. Add Firebase Instance ID of Your Device. To get Instance Token, check this doc

5. Tap Test and Voila

6. You should receive your test message within a couple of seconds