What “diagnostic tool” is popping up?
Again, what is the exact wording of Windows 10 error message that appears on screen when one clicks on a Share using Windows File Explorer? The details of that error message will often point the way on what the potential problem may be and how to fix or correct it.
Other ways to try and access the My Cloud, use the IP address for the My Cloud rather than the name in Windows File Explorer (example: \192.168.1.10). Also carefully read through the stickied thread Compilation of Windows 10 Methods, Steps and Solutions again just in case something was missed. Some of the procedures can be a bit confusing.
https://community.wd.com/t/compilation-of-windows-10-methods-steps-and-solutions/142576
