Please refer to the following link to configure your auto login
Should be the note under step 4 of option 1 below as the cause
https://www.tenforums.com/tutorials/3539-sign-user-account-automatically-windows-10-startup.html
If you turned on Require Windows Hello sign-in for Microsoft accounts (aka: passwordless sign-in), you will not see the Users must enter a user name and password to use this computer check box.
If your PC is currently joined to a domain, then the "Users must enter a user name and password to use this computer." box will not be available, and you will need to use OPTION TWO below instead.
You could also try the method here:
Users Must Enter a User Name and Password to Use This Computer Checkbox Missing in Windows 10
https://www.askvg.com/fix-users-must-enter-a-user-name-and-password-to-use-this-computer-checkbox-missing-in-windows-10/
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