AirPods case flashes orange and doesn’t charge
Flashing amber light indicates that you may need to set up your AirPods again.

From the Apple Support document, Charge your AirPods with charging case and learn about battery life.


  When you connect your Wireless Charging Case to a charger, or place it on a Qi-certified charging mat, the status light will stay on for 8 seconds. If the light flashes white, your AirPods are ready to set up with one of your devices. If the light flashes amber, you might need to set up your AirPods again.