MDT Admin Password

This setting alone won't protect you.

SkipAdminPassword=YES

You should also include this one.

AdminPassword=YourPassword

However, there is another way, if you don't want to set all your deployed computer with same password:-

When you create the installation TS, one of the step is to set Admin Password. 

 

This admin password will be the local admin password for all deployments with that task sequence. I have so far found it in the following 2 places.

There is once I changed the bottom one without change the AutoLogon one, and the TS stopped in the middle, prompting for password.

"Help" for "AdministratorPassword" shows:

To configure a blank administrator password, write an empty string in Windows System Image Manager (Windows SIM) by right-clicking on the Value setting, and choose Write Empty String. The built-in administrator account will be enabled with a blank password.

It seems OK to set them empty, but when I actually set both of them to "Empty String", the TS stopped asking to set it.

After I change both of them to the same non-Empty String, it start to work perfectly.