Cannot access my iPhone after it was found and was in Lost Mode
How can I turn off Lost Mode from one of my devices for a device I have found?
iPhone 16 Pro, iOS 18
You can sign into the same iCloud account on the other apple device and go into find my and turn it off. Here you can also find instruction on how to turn it off: Use Lost Mode in Find Devices on iCloud.com - Apple Support
You can also just alternatively go to iCloud.com and sign in and just press on find my and try turning it off from there too.