1. Check to make sure your home Wi-Fi network is working.
2. Check to make sure the camera is still connected to power.
3. Check the Resideo app or email to be sure that scheduled maintenance isn't happening. 
If the camera is still offline, try unplugging it from the AC power socket, wait 10 seconds, and then power your camera back on. Confirm that your camera is back online by successfully live streaming from the camera in your Resideo app.
Because other networks and servers are involved in a transfer, a temporary malfunction of these servers could also cause your camera to be temporarily offline.
If your problem isn't rectified, contact Resideo Support via the 'Contact Us' page.