If either of the below pop ups occur when CDM is authenticating into 365 then it needs WebView2 enabling. For version 2.14 and below details on how to do this can be found here.

For version 2.15 its enabled by default. This was released 22/03 at resources.iamcloud.net. If upgrading then for reference the change log can be found here

Error message:

Blank white window:

If you continue to see the issue then please contact support@iamcloud.com