Can't access My Cloud on Windows v1803

First, WORKGROUP has not been removed, it was Home Group that was removed from the latest Windows 10 update. See example images below. I have Windows 10 with all updates.

image

You will no longer find Home Group in the Control Panel.

Check this out and see if this is the problem. How are you trying to map the drive? Do you have WD Quick View?

Map using Quick View.

WDMyCloudMapWQV