Microsoft has confirmed yet another Windows 11 sign-in problem, and this one matters because it lands in the most sensitive place of all: the logon experience. According to Microsoft’s own Windows release health pages, a January 2026 update caused credential prompt failures and sign-in failures in some remote connection scenarios, including Windows App, Azure Virtual Desktop, and Windows 365. That may sound narrow at first glance, but the impact is wider than the wording suggests, because...