I am clear on users and passwords and local vs. non-local accounts but this problem has me stumped.
This is a standalone Windows 8.1 (upgraded from 8) PC, no domain.
User logon is username@yahoo.com with a password that is repeatedly confirmed to work at yahoo.com
Windows rejects the password saying to go to live.com to correct the problem
At live.com the username@yahoo.com are rejected as being a non-MS account
User also has username@live.com which was set up when they did the 8.1 upgrade. Those live.com credentials are accepted at live.com and the account shows the username@yahoo.com as the security confirmation email address.
There are no local user and username@live.com user accounts on the PC.
Any ideas?