If the battery indicator in the Bang & Olufsen app constantly shows 10% for both the left and the right earphone, regardless of the charge level, and Bluetooth pairing mode cannot be enabled after removing the earphones from the charging case (light indicator flashing white), the left and right earphones have lost connection to each other, and they need to be paired.
You can pair the left and right Beoplay E8 3rd Gen earphones by following these steps:
Pairing the left and right earphone of your Beoplay E8 3rd Gen