Hello
You should go to your Microsoft account https://account.live.com > Devices. See if your device is listed. It will also depend on if you have enabled location service prior, If you didn't, the Find my device will not work. In addition, if the computer is not turned on and connected to internet, it will not work either.
Unfortunately, most of the time stolen computer would be wiped and clean installed, in that case, find my device will not work. I am sorry.