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Wrong keyboard layout at login screen
Today we had high amount of service desk calls about users cannot login to their device due to "wrong" password. It turned out that UK keybaord layout has been set somehow and cannot be switched to ...
We are seeing the same issue in our company. Machines are Win 10 using English as core with MUI applied. Multiple countries throughout Europe reverting to EN-US keyboard. Attempted fixes won't stick.
FIX: I opened a case with MS and it went nowhere. Despite providing proof the cumulative update triggered this bug, they would not acknowledge it and had no fix. It appears to be a bug in the feature that automatically copies the user selected input method to the system account (which the login screen uses). We resolved (worked around) this bug in our company by disabling this feature with a GPO. Once this restriction was enabled, users could switch keyboard mappings once on the logon screen and the setting would no longer revert to English on the next boot.
Setting name: Disallow copying of user input methods to the system account for sign-in
Setting path: Computer/Admin Templates/System/Locale Services
Setting name: Disallow copying of user input methods to the system account for sign-in
Setting path: Computer/Admin Templates/System/Locale Services