A. 1. Check if the headphones are properly connected to the device. 2. Test the headphones with another app to ensure they are functioning correctly. 3. Restart the BirdNET app and try again. 4. If the issue persists, try using a different pair of headphones to see if the problem is with the original headphones.

B. 1. Check the audio output settings in the app to ensure it is set to use headphones. 2. If the app has an audio output option, toggle it between speaker and headphones to see if that resolves the issue.