Why am I seeing 'address unavailable' when using Find my iPhone?

I understand you're seeing "Address Unavailable" when using Find My iPhone. For reference, this resource has great information on how you can Locate a lost or stolen device. Based on what you're seeing, it sounds possible the iPhone is off or otherwise was not able to connect in order to share a location.

Why is Share My location unavailable on my iPhone?

Contact Apple Support if Share My Location is still unavailable on your iPhone even after troubleshooting. They might have to check for hardware issues. In the meantime, you can continue checking if specific users can see your live location on Find My. Is Share My Location unavailable on your iPhone?

Why is my iPhone location not available?

There isn't a lot you can do yourself if Messages or the Find My app says "Location Not Available" when someone has chosen to share their iPhone location with you. But it's still easiest to try these steps first, before involving somebody else. Sometimes, the Messages or the Find My app can bug out and result in the "Location Not Available" error.