One could always just map My Cloud Shares using the IP address of the My Cloud since you can reach the My Cloud Dashboard.
One thing to check, ensure both the computer(s) and the My Cloud are using the same Network Workgroup Name. Typically the name is: WORKGROUP
Other troubleshooting steps. Try disabling any security/firewall software on the computer (if using it) and see if the issue persists.
Ensure the Windows computer network option is configured for Private and not Public. More suggestions can be found in the following link.
