Arlo engineering has identified that some Ultra cameras (VMC5040) are offline and unable to reconnect to the Internet. If you’re experiencing this issue, use the link below to view the instructions to perform a camera factory reset of your Ultra camera to reconnect it to the Internet. We apologize for the inconvenience!
https://kb.arlo.com/000063208/How-to-troubleshoot-issues-with-Arlo-Ultra-Firmware-Update-September-15-2023