I have 2 computers, 1 still using windows 8.1 Pro and 1 I just upgraded to Windows 10 Pro. I am having an issue accessing a file share on from my Win10 computer to the win8.1. I have found I only have an issue on the Win10 computer when I use my Microsoft account logging into the Win10 computer when I attempt to access with Win8.1 file share it prompts for user and password, it says user or password is incorrect even though it is not...If I change my Win10 computer to use a local account when I access the Win8.1 computer it prompts for the user and password and accepts it with no problems. Is there something that the Microsoft account login changes which would cause a file share issue. 

You can map a drive by:

1. Right click on Computer.
2. Select Map network drive...

Disable "Secure Negotiate" on the client. 

https://support.microsoft.com/en-us/kb/2686098?wa=wsignin1.0

On Sun, 16 Aug 2015 23:21:36 +0000, arnavsharma [MVP] wrote:

Disable "Secure Negotiate" on the client. 

https://support.microsoft.com/en-us/kb/2686098?wa=wsignin1.0

This has nothing to do with the OP's pr

Hi gnaz,

Thank you for your question.

Please make sure SMB 1.0/CIFS File  Sharing Support has been installed under Turn Windows features on or off.

Then we try to run a System File Checker (SFC) scan to check for any file corruption. SFC scan will scan for corrupt system files on the computer and repair them.

1.Press Windows key + X, click Command Prompt (Admin).
2.In the Command Prompt, type the following command, and then press ENTER: sfc /scannow

If there are any questions regarding this issue, please be free to let me know.

Best Regard,

Jim

This did not fix the problem. I have switched from a Microsoft account to a local account login for now. The only thing I loose is Cortana, but I would rather have my smb network shares work. 

Hi gnaz,

By the issue, we suggest you delete Windows profile of Microsoft account on Windows 8.1 and Windows 10, then check if the issue persist.

If there are any questions regarding this issue, please be free to let me know.

Best Regard,

Jim