Why does the Xiaomi 15T Pro only show "Not Supported" with headphones?

Question

Accepted Answer

We appreciate your support of Xiaomi products. On the Xiaomi 15T Pro, if the 3.5 mm adapter is connected without actual headphones, the device cannot detect enough power through the cable. As a result, the system cannot recognize the adapter. The interface displays "Not Supported" when a wired headphone is connected.
This is normal and happens because the system relies on proper electrical signals from connected headphones to confirm a valid audio connection. Without these signals, the phone cannot register the adapter or any attached devices.
To ensure proper functionality, always connect the adapter along with compatible headphones. When headphones are properly inserted, the system will detect the connection and allow audio output as intended. This mechanism prevents errors and ensures that audio devices work correctly when fully connected.