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Issue: In CRM we cannot change the Name format (first name, last name) for existing users in CRM.
Impact: Functionality loss.
Ask: There should be a setting in CRM to change the name format for existing users.
STATUS DETAILS
Declined

Dynamics 365 Sales (administrator)
Thank you for your feedback. We are declining/closing this idea as it has been open for more than 2 years and has not received sufficient numbers of votes. If the idea is still valid, request you to re-submit the idea.