This means that you have missed an update or more and didn’t install them.
Outdated Windows – The users that have gone through this ‘Unknown error’ in Windows Defender are reporting that this issue could be also caused by your Windows being outdated. So all you have to do is to make sure that your Windows Firewall is enabled. But if one of them is disabled, the other one won’t be able to work as well properly. Disabled Windows Firewall – This could be the principal case because some affected people have managed to find out that the Windows Defender and Windows Firewall have a connection that makes them work together. But fortunately for you, to fix this you can either download and install the Microsoft Safety Scanner, or you can use the Microsoft Defender Offline scan This is causing the Windows Defender to not work, as well as other problems similar to this one or different. 
System malware – Another cause for this issue could be some hidden malware that your computer is currently harboring.
If the disabling was successful, you should also delete the 3rd party AV to get rid of the future risk. But for the ones that are using a 3rd party antivirus, it is worth trying to disable it to see if this will change something and fix the issue. This is not applicable to all people because not everyone other another antivirus other than the Windows Defender. 3rd party AV – One of the reasons could be the 3rd party antivirus that you are using.
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