Dear Flashy-Shinobi
Thanks for reaching out! Welcome to Microsoft Q&A. I'm Haien from Microsoft Q&A.
I’m sorry to hear you’re hitting a wall with those “username and password are incorrect” errors when trying to connect your two Windows 11 PCs for file sharing. It’s great that both PCs are visible in File Explorer’s Network section, so we’re already partway there! Even when both PCs use the same Microsoft account, Windows 11's network sharing can be tricky due to security policies. The "username and password" prompt is a common hurdle, and the credentials you've tried often won't work. The key is to use the correct format and a specific password that the system is expecting.
From that situation, I highly recommend you try these workarounds:
Solution 1: Verify Basic Network Settings
- On both PCs, go to Settings > Network & internet > Advanced network settings > Advanced sharing settings.
- Under your current network profile (e.g., Private network), ensure Network discovery and File and printer sharing are turned on.
- For the "Public folder sharing" section, turn on "Turn on Public folder sharing."
- For the "Password protected sharing" section, turn on "Turn on password protected sharing" (this is the default and most secure setting).
Solution 2: Set Up Folder Sharing
- Right-click the folder you want to share.
- Go to Properties > Sharing tab > Advanced Sharing > Check the box for "Share this folder" > Click Permissions and ensure "Full Control" is enabled for "Everyone" (or a specific user).
For additional information for similar topic about file sharing, please visit this article to know more: File sharing over a network in Windows - Microsoft Support
If you've already tried these steps and are still encountering issues, please reply to this thread with the requested details so we can investigate further and ensure your subscription is activated properly. Also, please keep me updated with anything new that you were try to each option.
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We appreciate your patience and look forward to resolving this quickly for you.
Warm regards