I have the same issue, I can successfully share an AirTag with another user, but that other user can’t see the AirTag, the Other user gets an “AirTag Not Reachable” or “No location found” status. In addition, if the Other user is near an AirTag in motion (e.g., we're traveling together while the shared AirTag is nearby), then they get the menacing "Unknown AirTag" alerts, even though the AirTag shows up as shared in the Other's "Find My".
Here are the devices used:
• AirTag, new from box, purchased a few weeks ago
• Me: iPhone 13, iOS 17.1.2 (I’ll use “Me” here to describe my phone)
• Other: iPhone 13, iOS 17.1.2 (I’ll use “Other" here to describe the person’s phone who I want to share the AirTag with)
• Other user location shared with Me in “Find My/People” and vice versa, with no issue, as “People” we can see each other; Other user can see AirTag in my “Find My/Items”, but can't see the location of AirTag
Here are the various troubleshooting steps I tried, none worked:
• Use “+” from Contacts to select an email or phone number directly when sharing, vs. choosing from suggested users
• Updated both Me “My Card” and Other “My Card” to use a “+1”, "or 1" in front of US phone number; updated Other’s Contact card for me, and vice versa to all match; also tried with no "1" just a "(111) 111-1111" format
• Confirmed that Apple ID emails match for Me “My Card” and Other “My Card” (e.g., the Contact card for me “My Card”, and the Other’s Contact card for me, match)
• Remove and replace AirTag battery
• Disabled and re-enabled Find My on each phone
• Disabled and re-enabled Privacy / Location Settings on each phone
• Disabled and re-enabled Bluetooth on each phone
• Assigned the AirTag to Other, then from Other shared with Me, Other could see the AirTag just fine, but when sharing with Me, I have the same issue – I can’t see an AirTag shared with me by Other
• Multiple restarts
• Tried different AirTags
Again, there is no issue with Me successfully sharing the AirTag with the Other user, but the Other user always shows “No location found”. Even worse, if the AirTag is near the Other user (e.g., if Other drives my car when I have an AirTag inside), Other user gets the menacing “Unknown AirTag” might be following you, even though the AirTag has been successfully shared!
Are there other troubleshooting steps I should try? It seems like a lot of users have this issue, please reply to this thread so Apple can find a solution? I bought these AirTags primarily to be shared (e.g., a shared bag or shared car), so the false positive alerts on "Unknown AirTag" defeat the purpose of me buying them in the first place.