The "Address Unavailable" message on Find My Friends means that the app has located your friend's device but cannot find a specific street address to associate with their location. It is different from "Location Not Available," which means the app cannot locate the device at all, possibly because the device is off, location services are off, or location sharing is turned off. "Address Unavailable" often happens when there is a GPS location but no exact address available in the map database for that spot, or the location accuracy is not precise enough to show an address. This can occur in remote areas, places without proper street addressing, or due to signal and privacy settings affecting location tracking. In summary:

• "Address Unavailable" = device located but no exact street address found.
• "Location Not Available" = device cannot be located or location sharing is off.

This means the device is roughly located but a detailed address cannot be displayed at that time.