Towards the end of September, Microsoft has published a Update for the latest versions of operating systems Windows, Including Windows 8.1.
Some users complained about installing the update KB4038792, the connection between their computers and the Microsoft account (outlook, MSN, live, exchange) was interrupted.
KB4038792 is a "cumulative" update that brings for Windows 8.1 besides fixing / solving some security issues and other improvements. So it will be quite difficult for users to detect which part of this update prevents logging into Microsoft's account. It seems to be something like a firewall that effectively blocks the connection between the laptop / PC and the Microsoft Account.
“Sign in to your Microsoft account
Sorry we couldn't connect to Microsoft services right now. If this problem persists, search for “network problems” on the Start screen"
This authentication issue was confirmed on September 22, 2017, by a Microsoft official, after a user notified on September 16, 2017 on the support forum, that he can no longer log in to the Microsoft account after the update KB4038792. The problem was reported on an HP 2G 250 laptop with Windows 8.1.
Microsoft acknowledges this problem, which, according to the company, affects a relatively small number of users in certain areas and systems / PCs that would have some common elements. Unidentified yet.
As a solution for users who use the account Microosft for authentication on Windows 8,1, is to use your local account until this bug is resolved.
Microsoft has promised that it will seek to remedy this issue as soon as possible.