Make sure to enable LiveLink and liveLinkXR plugins. Do you see the controller or tracker in the LiveLink window when you click source button in LiveLink window? Select tracker or controller.
Then go into Take Recorder, click Source -> From LiveLink and select a controller or tracker.
If that all works go to your code. Do you have his project? It’s on his patreon site and likely in the youtube video link.
Bring up his DroneCamera (or your blueprint) and Go to Windows -> Debug Blueprints. Press play and check that you’re getting a flow through the stages of the blue print.
If it’s flowing go to the Transform rotation pin and park your mouse over it. Move your controller/tracker. The numbers should update.
Put player into Simulate mode and select select DroneCamera in world outline so you see the preview. You should see the preview changing.
You can also choose another view but make sure to turn the DroneCamera to not hide during game. That way you can see the camera moving.