Windows 10: Win 11 computers cannot network but Win 10 can

I have 3 desktop computers that I need on my home network. Initially, Computer 1 has Win 10 Pro, Computer 2 has Win 10 Pro, and Computer 3 has Win 11 Pro. All three talked to each other, shared files etc. I then upgraded Computer 2 to Win 11 Pro.Now, Computer 1 Win 10 can communicate with Computer’s 2 Win 11 Pro and 3 Win 11 Pro and Computer’s 2 and 3 can also communicate with Computer 1, but I cannot get Computer’s 2 and 3 Both Win 11 Pro to communicate. The only change made was the upgrade on Computer 2 so it’s likely the problem.I have tried everything I can find to try:C

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Network between Win 10 and Win 11 computers

Some help, please. With respect to Win 10 to Win 11 machine, I've tried all of the suggestions shown here: Enter network credentials error on Windows 11/10 [Fixed] (thewindowsclub.com)

 

Win 7 and Win 10 on network

I have home network with separate modem, router, and WAP's. My Windows 7 computer does NOT list the Windows 10 computers on network computer list but the Windows 10 computers network list DO list the Windows 7 computer.

Turned off firewalls, gave permissions, shared drives. Nothing allows Win 7 computer to access the Win 10 computers.

Any suggestions for a fix?

 

Network between Win 10 and Win 11 computers

I had 2 Win 10 computers that talked to each other fine. Through Windows Explorer I was able to see and manipulate files one the other.

Now that one of the computers is Win 11, I can't see the other either direction. The target folders are all shared with full control permission.

When Win 11 looks for Win 10 I get a "can't access location" error. When Win 10 looks for Win 11, I get a log I'm requirement looking for ID an PW. (FWIW, my Win 11 computer makes me enter a PIN when I log in. I'd love to bypass that but can't figure how.)

Also FWIW, I've shut off firewall to see if Win 11 can reach Win 10 but still "can't access".

Suggestions?

Thanks.