Null or Unknown on Android 12

[sokunsamnang]

I tested on emulator and physical devices different version 12 is work. But when I tested on device Android version 12 there show unknown.

[shivam-modi]

https://developer.android.com/about/versions/marshmallow/android-6.0-changes.html#behavior-hardware-id
Android has disabled the functionality to read hardware identifiers for Android SDK >= 23. So, you can't read mac addresses for android version 6 and above

[pogojotz]

According to this and this it should still be possible with appropriate permissions set: LOCAL_MAC_ADDRESS, ACCESS_FINE_LOCATION