@Ahmed Reda Thank you for reaching out to us, As I understand you are looking for prereqs for Azure Active Directory Domain Services.
Please refer to this - https://learn.microsoft.com/en-us/entra/identity/domain-services/tutorial-create-instance#:~:text=before%20you%20begin.-,Prerequisites,-To%20complete%20this prereqs have been documented here
Let me know if you have any further questions, feel free to post back.
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