Trying to find a way to locate missing iPad from another iPad - not working
How do I find the missing iPad by using another iPads locator settings
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Not your iPad:
Open the FindMy app
Tap "Me"
scroll to the bottom and tap help a friend.
If the other iPad belongs to you simply open FindMy
To work, FindMy must be enabled on the missing device, it must be powered, and it must be connected to a network.
You may want to follow these steps: https://support.apple.com/en-us/HT201472