Local 4K live streaming is only available on the Arlo Ultra camera.
Your Arlo camera might not local live stream in 4K for the following reasons:
You attempted to local 4K local live stream on more than two cameras. You cannot local live stream in 4K on more than two cameras at the same time. When you attempt to local live stream in 4K on a third Arlo camera, the third camera streams in 1080p quality.
Your mobile device or computer is not connected to the same local network as your Arlo SmartHub or base station.