hopefully someone still reads this....
after some reading and testing during the last few hours i figured out (to my surprise) that in any case the sysprep-ootb process removes the admin account!
WindowsStar mentioned this in his answer... but i did not fully understand it at first. I thought it was just doint something wrong!
now i have two other questions that came up
1.) if i just go on and leave it the way it is (without the admin account).... what kind of problems could arise later? is the hidden admin account actually necessary for a windows installation to run properly? i am thinking that some functions might not properly run if it's not there. in case that it is "just another account" with elevated user rights i would just hand over the machine without it.
2.) in case it is not a good idea to run windows without this account still existing, how can i get it back after doing the sysprep-ootb but still get the "welcome and create your first account" on first start?
here is the situation:
i have prepared the installation in the way that it is needed and when i hand it over it has to start with the windows welcome... the same way it does after a fresh install. is there any other way to accomplish this? or what would i have to do to "fix" what i have already?
what i did was following the steps in
this microsoft document
it did not mention anything about that the process removes the admin account!
in other related documents i often noticed the mentioning of "answer files" and "unattended.xml" but i thought i would not have to bother with these for now. do I?
another problem is that i am on a timelimit and all the gurus that i know personally are no experts at this particular topic.
I hope someone of you can help me : )