Windows 10: PC seen by only one other machine on network workgroup

I have four computers on my network under Network in File Explorer.


Laptop1 can see Desktop2, Laptop1, Laptop2.

Desktop2 can see Desktop2, Laptop1, Laptop2.

Desktop1 can see Desktop2, Laptop1, Laptop2.

Laptop2 can see Desktop2, Laptop1, Laptop2, and Desktop1.


All four machines show Desktop1 Media Library. All four machines can ping the IP address of Desktop 1.


As you can see, all the machines can see each other except that Desktop1 appears on only one of the machines. They are all in the same workgroup and on the same WiFi. The networks are set up as private. [EDIT: I should have also mentioned that network discovery and file and printer sharing are turned on for Desktop1].


All of the machines run the free version of Avast except Desktop1 which runs Windows Defender. But I turned Windows Defender off briefly on Desktop1 and that did not resolve the issue, so I don't think the problem lies there.


The only difference I can see is that Laptop2 is Ver 1909 and the other 4 are version 2004.


If anyone can help, I would be appreciative.

:)

 

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