Nio - FAQ - What do do if sound is only coming out from one earbud

If your earbuds say “pairing successful” but you can only hear sound from one side, this indicates that the earbuds are no longer paired together. In order to pair them again, please put back both earphones in the charging case, wait for 5 to 10 seconds and lift both at the same time. If this does not work, proceed with a factory reset.