I am trying to merge 2 Jira cloud instances but have a couple of specific problems:
1) The source server (olddomain.atlassian.net) needs user emails to be updated (user1@olddomain.com -> user1@newdomain.com)
2) user1@newdomain.com already had data in the newdomain.atlassian.net instance we are migrating to with content (stories and tasks)
Don't ask how we got here. The cow is already on the ice. When I migrate the users with their updated email addresses into the new domain will Jira merge them? Or create 2 new users?