We have a GPO set message at logon that the Kiosk Auto-Login is getting stuck on. I couldn’t find an existing topic on this so wasn’t sure if it had come up before. Clicking OK on the message allows the process to continue.
Computer Configuration > Policies > Windows Settings > Security Settings > Local Policies > Security Options
Interactive Logon: Message text for users attempting to log on.
Interactive Logon: Message title for users attempting to log on.