The "Address Unavailable" message in the Find My Friends app usually means that the app cannot retrieve the exact or current location of the person or device you are trying to locate. This can happen due to several reasons:

• Location Services are turned off on the device being tracked.
• The device is in an area with poor GPS or network signal.
• The device is powered off, in airplane mode, or out of network range.
• Privacy settings or user preferences have disabled location sharing.
• The device has not signed in to iCloud or Find My.
• There are connectivity issues such as unstable Wi-Fi or cellular data.
• The Find My app does not have the necessary permissions to access location.
• The app or operating system may have bugs or needs updating.
• The device's location sharing is restricted or limited to certain people or for a set period, after which location won't be available.

In summary, "Address Unavailable" means Find My Friends cannot show the device's current location due to configuration, connectivity, or privacy settings rather than a permanent problem with the device itself. Checking device settings, ensuring location sharing is enabled, confirming internet connectivity, and updating the app can often resolve the issue.