For starters your confusing what the Dashboard actually is. The MyCloud.com/Setup is NOT the actual Dashboard even though it eventually takes the user to the Dashboard. That web address is one way to initially setup the My Cloud. The MyCloud.com site is the internet portal that allows a user to connect remotely to their My Cloud and download/upload files through their web browser to the My Cloud.
Generally one accesses the My Cloud Dashboard from their local network (NOT from a remote location) using one of the following addresses in their web browser:
Windows: http://wdmycloud
Mac: http://wdmycloud.local
That is NOT a My Cloud problem. that is a problem specifically with the configuration of PC #2. Because your using Windows 10 see the following thread for various thing to check in Windows 10.
https://community.wd.com/t/compilation-of-windows-10-methods-steps-and-solutions/142576
In particular do either General Method 1 (recommended) OR General Method 2. Then perform or check PC #2 against Windows 10 Specific Method #1 through #5. Then check your router or the router documentation to see if it supports Master Browser, if so perform the “If router/gateway supports Master Browser” step.
If you continue to have problems with PC #2 review the additional sections Mapped Drive Issues, Problems With Logging Into Private Share, and General Notes That Apply To Windows In General to see if that fixes/resolves the issue(s).
Lastly make sure the computer’s workgroup name (generally “workgroup”) is the same as the workgroup name in the My Cloud Dashboard > Settings > Network > Network Workgroup section. If not change one or the other so they are both identical
