Hello
Thank you for posting in Q&A forum.
You can come to Prerequisites Check means that you can connect to one of the DC from domain.
Error showing that this server can't get the NTDS information from MAAD01.
So please choose any available DC at the Domain Controller Options.
if you don't want to change the DC, you can try to use telnet or ping to check the internet between your server and MAAD01
I hope the information above is helpful.
Best Regards,
Yanhong Liu
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