The app needs a connection, because both parents have to be looking at the same record — there's no offline copy that could disagree with the other home's.
- Check another app or a web page loads.
- Tap Try again. The screen also retries on its own.
- If you're on hotel, airport or café Wi-Fi, open a browser and look for a sign-in page.
- Try mobile data instead of Wi-Fi.
If it says your connection is working
Then it isn't your network, and the message says so. Install any pending update from the App Store or Play Store — an out-of-date app is the usual cause. If it persists, email support.