Last week Microsoft announced that users can enable a feature that adds Windows Defender to a sandbox, which protects the computer from vulnerabilities found in Defender. A bug was discovered, though, that may cause you to think that this sandbox feature is enabled, when it really isn’t. […]

from https://www.bleepingcomputer.com/news/security/windows-defender-bug-needs-a-restart-not-shutdown-to-enable-sandbox/