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Managing multiple accounts in Microsoft 365 / EntraID (Azure AD)

When the same person uses multiple accounts as shown below, the sub-account SaaS accounts may be affected. They may be treated as resigned, or as guest accounts labeled “External”.
  • Main account: @abc.co.jp (employee master)
  • Sub-account: @xyz.co.jp
This guide explains how to assign the “Employee” label to the sub-account as well.

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Steps in EntraID (Azure AD)

  1. Go to the Azure Active Directory site, click Sign in, and log in to Azure AD.
  2. Open the user’s properties, go to Contact info, and edit Other email to add the sub-account’s email address. If the user has three or more email addresses, add them the same way.
Azure AD user properties screen

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Steps in Microsoft 365

The Microsoft 365 admin center allows you to add only one email address. EntraID supports adding multiple addresses, so we recommend using EntraID if you are a Microsoft 365 customer.
Go to Manage user roles and edit Alternate email address. Microsoft 365 admin center — manage user roles screen Edit alternate email address screen Multiple email addresses added successfully

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Re-synchronizing

After adding the email address in each service, perform a re-sync with Microsoft 365 or EntraID in this service. Re-sync button in this service From the left menu, search for the main account under Accounts and confirm that the sub-account address is linked.
Last modified on July 14, 2026