Get notified about username conflicts in Apple Business Manager
In Apple Business Manager, you can get notified about federated authentication username conflicts in case you have to notify specific users to create new username information. After a domain is successfully added, Apple searches through all existing Apple IDs to find any Apple ID using that specific domain name. If one is found, Apple Business Manager lets you notify that person — and any device connected to their iCloud account — that they must update their Apple ID username so you can use it for your organisation. During the update process, they do not have to change their password, and all their purchases and data remain in their account.
For example, say your organisation registered the domain @example.co.uk several years ago and set up email addresses for all their employees. Jane Appleseed decided to use the email address she was assigned, “firstname.lastname@example.org”, as her personal Apple ID.
Even if Jane no longer works for the organisation that registered example.co.uk, she still has the Apple ID with that domain name. Because you are setting up federated authentication for the domain name @example.co.uk, Jane must change her Apple ID username so that you can create the Managed Apple ID email@example.com if you want.
How Apple notifies users whose Apple IDs conflict
Apple will identify users whose Apple ID contains the domain name you have registered. Those users receive a mail message and a notification telling them they must rename their Apple ID. If they have not renamed their Apple ID yet, they keep receiving notifications and mail messages, with one final mail message at 60 days. After 60 days, the user’s Apple ID is automatically renamed to a temporary username, and the original username is released and claimed by your organisation.
Get notified about federated authentication username conflicts
In Apple Business Manager , sign in with an account that has the role of Administrator or People Manager.
Tap Activity in the sidebar, then tap Checking for Conflicts.
If any username conflicts are found, you will see a dialogue with the total number of username conflicts.
WARNING: Be aware that enabling federated authentication will impact all users across the domain that you federate. You should speak to your IT administrator before initiating the federation process.
Tap Continue, tap Send Notifications, then tap OK.
Each user with a username conflict is sent a mail message and a notification to any device connected to their iCloud account, letting them know they must change their personal Apple ID.
You can view the process of sending mail messages to users with a username conflict in the Activity section of Apple Business Manager, but you cannot see their actual Apple ID.