Mavic lights are not on while flying. Any tips appreciated.

Go into your setup menu and see if the setting got turned off.

Are you recording?

The front red LED lights switch off whilst recording video and blink off when taking a still so that the red hue from the lights don’t distort the image quality. You can adjust this setting in the app and also toggle to leave them off permanently if, for example, you’re learning to fly and using them to orientate the drone in flight is more important than the video quality.