We are planning to migrate our existing Atlassian Cloud (together with Jira and Confluence apps) instance from one Azure AD domain (username1@AAA.com) to another (username1@BBB.com). There is no change in tenant license subscription and company contact. We will be setting up new Azure AD user accounts in the target Azure AD domain that the current users will then use to sign into all their apps.
We would like to retain the Azure AD usernames while only changing to a different domain name in the current Atlassian Cloud instance so that upon migration, users can sign into their new Azure AD user accounts and continue to access all tickets and other data associated with their current Atlassian Cloud user accounts.
I would appreciate if anyone can advise or direct me to any articles on this migration.