ODM Mailbox migration fails with error: "Mail migration failed because the target user does not have a license for a mailbox" (4361793)

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ODM Mailbox migration fails with error: "Mail migration failed because the target user does not have a license for a mailbox"
説明

You have performed the Discovery of an account and then matched, migrated, or mapped it between the source and the target. However, when migrating its mailbox, the mail migration fails with the following message: "Mail migration failed because the target user does not have a license for a mailbox". Checking in the target tenant, you see the user mailbox has Exchange Online Plan 1 license assigned and mailbox created.
原因

If you may have discovered an account and either mapped, matched, or migrated while the same account didn't have assigned an appropriate license for mailbox, such an issue can be triggered.
対策

You may follow the below steps in resolving such a case:
- Select the Account in the Accounts tab that has the issue with the mailbox license
- Click on the Match option and unmatch that account
- Delete the account in the Accounts tab (don't delete anything either on the source or target O365 tenants)
- Re-run Discovery Accounts
- Match/Map this account
- Re-run the Mailbox migration

The above steps should clear previously cached mailbox license information

You may follow this KB for unmatching the account
How to fix an incorrectly mapped account? (262036)

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