Office 365 – Unable to remove verified Domain name


Problem:
When you are trying to delete a verified domain name in Office 365, an error pops up saying that some users or Office365 services are still attached to the domain.
Root Cause:
Just like what the error said, some of the Office 365 services or users are still attached/assigned to the domain name that you are trying to remove.
Solution:
Things to check:
- Ensure that no users are associated with the domain that you are trying to delete. You can verify this by going into Users And Groups, and Edit a user. Ensure that the domain you are trying to delete, eg, abc.com, is not listed there.
- Ensure that no security groups/distribution groups have the accounts attached to abc.com. Security groups/distribution groups can be access by logging into Office 365, click on Users And Groups, and click on Security Groups.
- If you have just deleted the users, or changed the domain for each individual users, you will need to wait for a while (1 min?) as it will need to sync the changes to the different Office365 service settings.
- If the accounts are uploaded to Dirsync, you will need to stop the Dirsync synchronization to change the accounts to a Cloud Only account. Then, you will need to do step 1-3 above to delete the Security groups; and/or manually modify the e-mail addresses fields in Office 365, Exchange Online.
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