Reset a verification phone number in Apple Business Manager
All Apple Business Manager roles require a six-digit verification code along with their Managed Apple ID account password. This verification code, which is sent to a phone number associated with the account, enhances the security of Apple Business Manager.
Note: New verification codes are required every 30 days.
If the account owner changes phone numbers, you can reset the account to ask for a new phone number. Accounts that have identical privileges or lesser privileges can be reset only by you.
Reset a verification phone number
In Apple Business Manager , sign in with an account that has the role of Administrator, Site Manager, or People Manager.
Click Accounts in the sidebar, search for an account in the Search Accounts field, then select the account from the list. See Search for user accounts.
Click Reset Phone Number , click Reset.
When the user signs in again, they are prompted to add a new phone number.