Data Migration Outlook 365 to G-Suite

Question

I am trying to bring our old email data over from Outlook 365 to google workspace. I keep getting this error: Exchange Impersonation error. Unable to open user mailbox due to impersonation error. Please make sure impersonation is set properly. (11021)

Answer 1

Hi @Michaela Langley

Have you assigned the required permission in Exchange Online admin center?

For more details please refer to this similar thread:

Exchange Impersonation error. Unable to open user mailbox due to impersonation error. Please make sure impersonation is set properly. (11021)

The general steps are:

1. Log into to ECP e.g. https://outlook.office365.com/ecp
2. Select the Permissions menu, then Admin Roles
3. Create a new role by clicking on the + sign
4. Give it a name e.g. GSuiteMigration
5. Click on the + under roles and add the ApplicationImpersonation & ViewOnly-Configuration
6. Click the + sign under members and add the admin that requires the impersonation role
7. Save and rerun the migration steps

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