Desktop Computer Not Showing Up in Explorer Win 10 After Update

My network:
Desktop Computer ("Office-10") connected directly to the Router (Amplfi HD Mesh Network).
Desktop computer ("Basement") connected via WiFi
Laptop computer ("Ryan") connected via WiFi
Various printers/scanners

Everything has been working great, status quo, for months, No changes to any hardware in the system, no changes to BIOS, etc. Everything has been static except for OS changes.

I can no longer see "Office-10" from any of the computers on the network, including "Office-10."
I can, however, see "Office-10" under Media Devices from each computer on the network. I can also connect to "Basement" and "Ryan" from "Office-10."



OS: Window 10 Home, Ver 1903, OS Build 18362.356

I've tried all the "standard" fixes (Function Discovery Resource Publication, etc.) to no avail. Again, this system was working perfectly for many months, and now "Office-10" is gone.

Thanks in advance for any assistance.

Scott

Thanks for the reply.

What I mean is, the problem seemed to have developed after the 1903 update. I don't have a specific date when the problem occurred; it's not somewhere I look daily.

There have been no other updates to software or hardware to the system other than the OS updates. I'll check News to see if something applies; I haven't seen anything on point yet.

It's bizarre to me that the system shows up on the Media Device list, but not as a Computer.

Thanks. All computers running the same Ver/Build of Win 10.

I've run all the items in the tutorial, including SMB1, prior to posting.

The Here Today, Gone Tomorrow aspect is maddening.