Hello ~ Your lost device is offline and the Lost Mode status will say pending. This means that the device is offline and iCloud cannot communicate with the device yet. However, as soon as your device comes online then your Lost Mode command will take effect. Click here for more details…
If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support*
*Mark as Lost
When you mark your device as lost, you remotely lock it with a passcode, keeping your information secure. This also disables Apple Pay on the missing device. And you can display a custom message with your contact information on the missing device.
Click here>>>>>Mark your device as lost for more information.
Good luck!
~Katana-San~