If your privacy settings in Office have changed you'll be prompted to restart Microsoft Office. If you didn't change the settings yourself, it's possible that your IT administrator made a change that affects your device, or that a change you made on a different device has synced to this device. The restart is necessary because we can't apply new privacy settings to services that are already running. Once you restart Office you should be able to resume using Office normally, with your new privacy settings selected.
Note: If you have more than one Office app running you'll need to restart all of the running Office apps for the updated privacy settings to take effect.