Defender for Endpoint - Unified onboarding failed on 2012 R2 - MpAsDesc.dll 310

I have received this error when installing Defender on Server 2012R2 that appear to have Defender previously uninstalled. If you open up Services, and open the description of the Microsoft Defender Antivirus service, you will see its description as "<Failed to Read Description. Error Code 2>. If you see this, open the registry and delete HKLM\SYSTEM\CurrentControlSet\Services\WinDefend. Reboot the server - you will now be able to install Defender.