Hello,
Thank you for being part of Microsoft Community. We hope we can help you at our best when it comes to Network Sharing.
May we know if, do you really need to enter user credential when accessing a Network (HomeGroup) computer, or in sharing files to other computers? Was this set on purpose?
Cause if not, we're thinking if we try to get rid of the "Enter your credential . . ." popup?
Go to Control Panel > All Control Panel Items >Network and Sharing Center> click on Advanced sharing settings. Expand the Private section, and ensure that these three are selected:
Turn on network discovery
Turn on file and printer sharing
Allow Windows to manage homegroup connections
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Are the computers sharing the same Microsoft Account as user profile while trying share files? Cause if yes, then the "incorrect password" error must have been generated by this. The system is getting confused with same user names.
The solution for this is to input the Computer name together with the user name. For example, you are trying to access Computer1 and the current user for both (or for all) PCs is Frank, put in the input field: Computer1Frank. Then enter the password for it.
We have more ideas, but please feel free to try those first, before we dig deeper.
Kind regards.