Error migrating Accounts, "The proxy address "SMTP:user@domain.com" is already being used by the proxy addresses or LegacyExchangeDN.
説明
When migrating Accounts with On Demand Migration (ODM), you may see the following error:
The proxy address "SMTP:user@tenant.onmicrosoft.com" is already being used by the proxy addresses or LegacyExchangeDN. Please choose another proxy address.
対策
This error is caused by another object in the target Office 365 environment that is already using the SMTP address of the object you are trying to migrate, which is causing a conflict. This conflicting object in the target tenant could be a group, user, shared mailbox, etc. This conflict will need to be resolved in order to migrate the account successfully.
