The d7x v19.3.2 Release adds an important new feature for Windows 10 and Microsoft accounts. During any restart to Safe Mode initiated through d7x, it will now automatically create a temporary admin user IF the current user account is a Microsoft (online) account. The temporary admin user named “d7x_TempAdmin” contains no password for login, and will be deleted automatically during End Session. If you are logged in to that user account during End Session, you will be prompted to End Session again from another user account, and then you will be logged out.
This feature was added because typically a Microsoft account password will NOT allow login to that user account in Safe Mode. For one thing, if you can’t login to Safe Mode then there was no point in rebooting to Safe Mode, but there is another good reason to do this. Because d7x modifies the BCD to automatically start in Safe Mode, it must run in Safe Mode again to undo the modifications, which it normally does automatically; but it cannot run if a user does not login to Safe Mode, and this would trap the PC in a Safe Mode loop.
A second new feature tied to the same reasoning will prompt you to create this same temporary user if on the Session Start prompt you select to AutoLogin a user to Windows and the selected user account is a Microsoft account. This is recommended not only in case you need to boot to Safe Mode, but also in case you use the wrong password for a Microsoft account, which if you did you would then be stuck in a logon/logoff loop.