@mathieu-aubin Good question. Yes, in modern version of Android the MAC address of your device (for each network adapter) and all the devices on your local network are hidden from the apps to prevent advertisers or other potentially malicious entities from tracking you. This is a great win for our privacy, but is unfortunate for PortDroid.
Previously the Local Network Scanner would show these MAC addresses and use them to determine what device is, as shown below:
But now it looks more like this:
mathieu-aubin on android.. settings - about - status shows the MAC
The settings application is a system app, so it has special permissions to view the MAC address, whereas any other regular Android apps can no longer get this.