Perform the following in the Azure Console:

1. Go to Virtual machines
2. For each virtual machine, go to Settings
3. Click on Extensions
4. If there are unapproved extensions, uninstall them.

Perform the following in Azure Command Line Interface 2.0:

From the audit command identify the unapproved extensions, and use the below CLI command to remove an unapproved extension attached to VM.

az vm extension delete –resource-group <resourceGroupName> –vm-name <vmName> –name <extensionName>

References:

1. https://docs.microsoft.com/en-us/azure/virtual-machines/windows/extensions-features