Windows 10: Folder Sharing Problem on Home (Workgroup) Network

I'm John and I'm unable to share a folder on my PC with a specific person on a different PC on our home workgroup network. I can share the folder with Everyone, but Windows fails to find the specific user on our home network. We have 3 Win 10 PCs on our home network: MaryPC (user account is Mary), JohnPC (user account is John), and TheaterPC (user account is JM), and all are visible on File Explorer on all PCs. The Workgroup name is Golden. We do not use any log-in credentials to access any of these PCs; i.e. no usernames nor passwords are required nor do they exist.
I'm able to share my Music, Pictures, and Video folders with Everyone (with R/W permissions) in the Golden Workgroup. However, I am unable to share my Medical folder (for example) with Mary only. When I try to share this folder with a specific person (by trying to add Mary), Windows responds that it is unable to find user Mary. In trying to add Mary to the list of specific persons, I've tried numerous combinations of Mary and/or Golden/MaryPC/Users/Mary to no avail. This same problem exists on MaryPC and on the TheaterPC when trying to share a folder from those PCs to a specific person on another networked PC. Sharing a folder with Everyone works fine across the Workgroup, but sharing a folder with a specific person/user on the network is hitting a brick wall. Any solution ideas?

:)

 

I couldn't access a shared folder between the laptop and the PC?- Windows 10.

Original Title - Shared folder abruptly stopped

I have a problem networking a laptop running Windows10 Home, with a desktop running Windows10 Pro. I had no problems with the network when upgrading to Windows10 on either machine, then abruptly it stopped whereas I couldn't access a shared folder between
the laptop and the PC ?

The folder has everyone access and since I'm running a workgroup, both laptop and PC are on the same workgroup as well.

 

What is the diffs between Homegroup and Workgroups, How are they different and are they the same as a network

Hello,

Homegroup - A homegroup is a group of PCs on a home network that can share files and printers. Using a homegroup makes sharing
easier. You can share pictures, music, videos, documents, and printers with other people in your homegroup.

Workgroup - In computer networking, a workgroup is a collection of computers on a local area network (LAN) that share common resources and
responsibilities. Workgroups provide easy sharing of files, printers and other network resources. Being a peer-to-peer (P2P) network design, each workgroup computer may both share and access resources if configured to do so.About.Tech

 

It should be \\marypc\mary

 

Thanks Samuria, but this didn't work. Still says "Windows was unable to find \\MaryPC\Mary"