I have an issue with Find My location sharing between me and one specific person.
Their iPhone location is visible to other people, and they can see my location. I can also see other people's locations normally. Their iPad location can be shared with me successfully, but their iPhone location shows “No Location Found” for me.
We have both restarted our phones, checked Find My and Location Services, removed and re-added location sharing, and I have also hard-reset my iPhone. Nothing has fixed it.
This appears to be specific to the Find My sharing relationship between our two Apple Accounts.