Hello Daisy,
This occurred subsequent to a clean, original install (from the Windows 7-to-10 upgrade) of Win 10-64 Pro on a Thinkpad T530, also found on a client's Dell Precision desktop.
- Create local user (not Live acct) during install.
- Link to Live acct.
- Create Shared folder.
- Verify Share from another PC on LAN with same Live acct.
- Update to v1909 or better on Sharing PC.
- After update, when trying to access shared folder, Live acct user will be prompted to login, which will fail with "password expired" message.
It took some time (2 days, actually) to narrow down the problem because when it first presented itself (quite some time ago) I found that a) granting rights to EVERYONE did not resolve it for this user, and so I b) fixed it quickly by logging in as the local admin for the sharing PC.
I fixed it on my bench system by deleting/adding the problematic profile, however I wish I had tried unlinking/relinking the LIVE account to the user ID before I blew away the profile!
best/joe.