I just upgraded from iPhone 15 Pro to iPhone 18 Pro (iOS 27.0.1) and 3 out of 4 friends on FindMy show "Off-Network" and can't be located, but one of my friends shows up. I confirmed that the one friend who shows up just upgraded to the same phone and iOS as me. My other contacts are still on older phones and iOS 26. I suspect this is an iOS27 to iOS26 issue. Any resolution to this?
I tried all of the troubleshooting methods I could find online and with AI to fix this and the suggestions did NOT resolve the problem. Troubleshooting included (but not limited to): Confirmed all settings are correct, confirmed "Sharing from this phone", cellular data turned on/off/on for FindMy, Toggle FindMy on/off, airplane mode on/off, reset network settings, logged in and out of media and iCloud, and of course rebooted in between each change, and more.