getMacAddress() returns null in Android 11? How to get mac address for Android 11?

{
    try {
        List<NetworkInterface> all = Collections.list(NetworkInterface.getNetworkInterfaces());
        for (NetworkInterface nif : all) {
            if (!nif.getName().equalsIgnoreCase("wlan0")) continue;

            byte[] macBytes = nif.getHardwareAddress();
            if (macBytes == null) {
                macTestResultString = "";
            }
        }
    } catch (Exception ex) {
        Log.e(App.TAG, EXCEPTION + ex.getMessage());
    }
    return macTestResultString;
}