Hello BAB-7997,
Thank you for posting here.
A list of questions need to be considered before domain rename, and whether your AD environment is suitable for domain rename. Please refer to this similar post below.
Internal Domain Rename
https://learn.microsoft.com/en-us/answers/questions/77503/internal-domain-rename.html
For more information about domain rename, we can refer to the links below.
Step-by-Step guide to rename Active Directory Domain Name
https://www.rebeladmin.com/2015/05/step-by-step-guide-to-rename-active-directory-domain-name/
Step by Step How to Rename Domain Name in Windows Server 2016
https://newhelptech.wordpress.com/2017/06/25/step-by-step-how-to-rename-domain-name-in-windows-server-2016/
How Domain Rename Works
https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2003/cc738208(v=ws.10)
Hope the information above is helpful. If anything is unclear, please feel free to let us know.
Best Regards,
Daisy Zhou
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