my iphone 8s did not show up in the list of all devices in FIND MY IPHONE, how can i find my lost phone
my iphone did not show up in the list of find my iphone app on my mac
iPhone 8 Plus
As per this article https://support.apple.com/kb/ph21251?locale=en_US
If one of your devices isn’t listed, make sure it’s set up for iCloud with the Apple ID you used to sign in to iCloud.com. If it’s an iOS device, make sure it has iOS 8 or later. If it’s a Mac, make sure it has OS X 10.10 or later.
Read this also https://support.apple.com/en-in/HT204233