This morning I rebooted my computer to finish installing a Windows 11 update that downloaded overnight. A short time later when I wanted to look at one of my My Cloud devices nothing was showing under Network. I checked SMB 1.0 and found items that were off. Once I checked their boxes and rebooted my computer, all my devices are showing again. To check for this if you have the same problem type, turn windows features on or off , using the seach icon on the taskbar.
Please refer to the following article My Cloud OS 5: Cloud Access Device Offline: