Troubleshooting
Nothing happens, the camera is busy, gestures misfire, or the phone gets warm.
Nothing happens in other apps: open Setup and check that every required row has a check mark and that Home says Everywhere on. If the accessibility row is green but taps don't work, turn the service off and on again in Android settings.
"Camera in use by another app": close the other camera app or video call. Tracking picks up again by itself when the camera is free.
Gestures misfire: face a light, keep one hand in view, and pause briefly between gestures. In Settings, lower Sensitivity, choose a Long cooldown or turn on Require wake gesture. Set gestures you don't use to Nothing in Edit gestures.
Gestures aren't recognized: try them in Practice. Hold the hand about an arm's length away; swipes need to be quick and straight.
Phone gets warm or the battery drains: Everywhere slows down when the phone is warm and when no hand is in view. Pause it when you don't need it, and avoid charging and Everywhere at the same time in a hot room.
Everywhere stops on its own: allow background use in the Battery guide; some phones end background apps aggressively.
Still stuck: Settings, About & diagnostics, Share diagnostics, and send the report to support. It contains no images and nothing that identifies you.