This behavior is caused by a change in Windows 8.1 and does not affect Windows 8 or earlier versions. When Exchange Active Sync (EAS) password restrictions are active, the autologon feature does not work.When the policy is changed so that it does not affect the computer, the autologon feature works as expected. This registry change does not work if the Logon Banner value is defined on the server either by a Group Policy object (GPO) or by a local policy.To bypass the AutoAdminLogon process and to log on as a different user, press and hold the Shift key after you log off or after Windows restarts.You can configure the device to sign in manually or automatically for the Assigned Access account.

When your kiosk device restarts, regardless of the cause such as from an update or power surge. You may want to set up an automatic logon for your kiosk device. Kindly refer to these related guides: How to disable auto login in Windows, how to enable Automatic Logon on Windows 10, how to enable automatic logon on Windows 10 via the Registry, and how to setup Kiosk mode on Windows 10 with AD user Account. This setting is recommended only for cases in which the computer is physically secured and steps have been taken to make sure that untrusted users cannot remotely access the registry. The specific registry key that stores this value can be remotely read by the Authenticated Users group. Additionally, when autologon is turned on, the password is stored in the registry in plain text. If you set a computer for autologon, anyone who can physically obtain access to the computer can gain access to all the computer’s contents, including any networks it is connected to. However, this feature may be a security risk. The autologon feature is provided as a convenience.

Sysinternals windows 10