Hello @Johnson George ,
Thank you for posting here.
Based on the description, I understand you want to know the list of Do's and Don'ts available to rename domain.
Based on my knowledge, your AD environment may not meet the requirements of domain renaming, you can check it according to the similar posts below.
Here is a post I answered in the past with marked answer for your reference.
Internal Domain Rename
https://learn.microsoft.com/en-us/answers/questions/77503/internal-domain-rename.html
If the domain renaming requirements are not met, we recommend that you migrate to a new domain or rebuild a new domain.
Hope the information above is helpful.
Should you have any question or concern, please feel free to let us know.
Best Regards,
Daisy Zhou
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