Check Windows Defender MAPS Cloud Service
Microsoft Active Protection Service Connectivity
If you use the Windows Defender or Microsoft Defender Advanced Threat Protection, make sure that the MAPS also has a connection to the cloud.
MAPS (Microsoft Active Protection Service Connectivity) also known as the Windows Defender Antivirus Cloud Protection Service.
The connection can be checked by issuing the following string in the CMD:
"% ProgramFiles% \ Windows Defender \ MpCmdRun.exe" -ValidateMapsConnection
The result should look like this: