How to fix the controller not syncing issue

90% of sync issues get fixed by completely powering off the console and controller, then turning them back on from scratch - wait a few seconds before restarting everything. If that doesn't work, try resetting the controller itself: there's usually a small hole on the back where you can stick a toothpick for 10-15 seconds, then resync from the beginning. If it still doesn't work after that, the battery's probably completely dead or the controller has some hardware issue, so try charging it for a good hour or consider getting it checked out.