Why can't I locate my lost I iPhone
What can I do to find my lost iPhone when all devices is offline
iPhone 7 Plus, iOS 14
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If the lost device is offline then it is not going to be able to broadcast its location.
To locate your iPhone in the Find My [Device] app, you must have activated the Find My app BEFORE the iPhone was lost. Here is some information on that app ➔ If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support.
Note that your lost iPhone must be able to make the connection to the internet via Wi-Fi or cellular connection so that it can mark its location and broadcast it.
Axel F.