Glad you were able to work your problem out.  Thanks for the suggestions.  Unfortunately, it didn't work.  The Dells still will not allow access to each other, but the Sony accesses them both just fine. We'll see what the Geek squad can do.  Maybe they know how to get Dells to network with each other.
I receive the "you do not have permission to access" error when attempting to access files between an Alienware desktop and a dell laptop.  I have a Sony laptop and it is able to access files on both of those pc's and they can access the Sony. I am running Windows 10 home, all units are in the same workgroup. My wireless setup is a Velop mesh network. All network settings across the 3 pc's are identical. Has anyone else run into this situation?  If so, is there a solution?  I have tried everything I can find on the web to no avail. What specific Alienware desktop model? DELL-Admin
File Sharing Not Working