Navigate to https://www.office.com/
In the upper right corner of the screen click your profile picture
Click "View Account"
Look for the tile that says "Security Info" and click "UPDATE INFO"
Locate the correct device and click "Delete"
***To add a device back to your account, please click canton.teamdynamix.com/TDClient/2726/Portal/KB/ArticleDet?ID=132522 and follow steps 4 - 15***