Whenever you set up a Bark Phone, you'll see a Bark Phone button under your kid on your parent app / dashboard:
The Bark Phone button will disappear whenever:
The Bark Phone service is suspended from too many failed payment attempts
To fix this, go to your account settings.
Tap Update billing info (it's okay if you're entering in the same payment information as before).
Once the account is in good standing, your Bark Phone service will resume!
Then, check if the Bark Phone tile has returned. If it has not, tap on the Guard Dog app on the Bark Phone and see if there's a setup QR code you need to scan to re-pair the device to your account (it may take a few minutes or a device restart for it to appear).