@technologyt1882537: There are a few scenarios.
1. If you are using the sync from Azure or Google, you have to update the user on your AD, which will be updated on the Adobe Admin console.
2. If you would like to edit the user on the Admin console when the Sync is enabled, then you have to enable the editing option under Settings-->Directory-->Sync--> Go to Settings--> Enable editing.
This will give you a window of 30 minutes to make changes. You can use the CSV file now to make changes or do that manually by opening the user account on the Admin console.
Azure Sync
3. If you are not using SSO and have users as Business ID with their Authentication account as Adobe ID then, the user has to change the name under accounts.adobe.com. Adobe IDs cannot be modified from the Admin console.
Update profile Adobe ID
Thanks,
Nikhil Gupta