Why are the the Xiaomi Buds 5 Pro connected but there is no sound?

For your reference, here are the reasons about no sound:
1. Due to the specificity of earbuds, electromagnetic waves in your area will interfere with Bluetooth connections, causing silence;
2. Please check the phone’s volume settings to ensure the phone volume is not muted;
3. The phone is too far from the earbuds, exceeding the effective transmission distance (10m), or obstacles block the path between the earbuds and phone;
4. When the phone is connected to two Bluetooth devices simultaneously, sound will come from the second device, and the first connected device will have no sound.
For your reference, here are the solutions about no sound:
1. Please confirm if your earbuds are in an environment with strong interference and stay away from objects with strong electromagnetic interference such as microwaves;
2. Unmute the phone and try increasing the volume to see if the sound is normal;
3. Use the phone and earbuds together or reconnect them;
4. Disconnect, place the earbuds back in the charging case, close the lid for 5 seconds, open the lid, and reconnect to the phone or disconnect the phone from another Bluetooth device;
5. If none of the above works, try resetting to factory settings. Place both earbuds in the charging case, open the lid, and press and hold the function button for 10 seconds until the indicator light blinks continuously to complete the factory reset.