We have migrated our CRM from a Veeva Org to a native Salesforce Org and I'm trying to reuse the usernames to ease the transition. I've managed to update the usernames in the old Veeva org for the users but we have had someone return to the company whose username was not updated in the Veeva org and this org is now no longer available to change their old username. Given the Veeva org is now no longer available is there a method for changing the username in the od org without access so that they can have the username in the same format as their colleagues?
Andrew Russo (BACA Systems) 
Forum Ambassador
you will need to log a case with salesforce support. they should be able to track down the taken usernames. I've had it happen when users used their company email in trailhead it caused all sorts of issues.
