Help syncing my Garmin Edge 530

Everything is working fine until I try to sync it via Bluetooth with Garmin Connect Mobile. The heart rate monitor works, the power meter works, and it syncs with the watch so I can extend the display. But when I try to connect the cycling computer directly to my phone, everything looks fine until it shows the pairing number. I press accept, it stays there for a moment, and then it says there was an error.

I already finished updating it, and in theory everything should be correct now. What should I do? What do you recommend?