To pinpoint the cell phone location by Find My Device, you need to do the following:
Step 1: Verify if Find My Device is on
In case it is switched off, go to your phone’s Settings, tap Security & Location (or, Google then Security), and tap Find My Device. Toggle it on.
Step 2: Turn on Location, if necessary
The procedure is the same: tap Security & location and after Location. Turn on Location.
Step 3: Verify whether Google Play is visible
If the device is hidden on Google Play, in Find My Device it is not visible as well. To make it evident, go to Google Play Settings and under Visibility choose the device.
Step 4: Check this out
Go to android.com/find and log in to a Google account. If there are a few Android devices, then click one at the top of the screen.
These are preliminaries in order to track a cell phone location with Google.