Vulnerability - Windows Server 2008 EOL

I have one question:
I have one server with OS Windows Server 2008 which is EOL from 14th January 2020. I have scanned this server several times but vulnerability with EOL Windows Server 2008 did not appear. I tried to scan with credentials this server but got the same results.
Version Greenbone Security Manager: Greenbone OS 6.0.7.
Don´t know why I can´t detect this error?
Thanks for answer or advice.

Closing as a duplicate of Missing Windows version in "OS End Of Life Detection". Please follow up there if you have further questions around this topic.