Troubleshoot Exchange Online data migrations

Exchange Online Calendar migration using the new data migration service is currently in beta and subject to the Pre-General Availability Offerings Terms in the Google Workspace Service Specific Terms.

Can't start a migration

If you get an error when you try to start a migration, make sure that a Google Workspace user with super administrator privileges sets up and initiates the migration.

Need permission to access resources error

If you get the error, Needs permission to access resources in your organization that only an admin can grant, make sure that you're trying to connect to the Microsoft account using a valid Global Administrator account. For details, go to Connect to your Microsoft account.

User account issues

Before you begin a migration, you have to set up the user accounts in Google Workspace. For details on setting up user accounts, go to Requirements & setup steps for Google Workspace.

A user account that is not set up, or set up incorrectly, can cause the following issues in the logs.

Logs message	How to fix
User not found	Set up a Google Workspace account for the user if they don’t already have one. Turn on the Gmail and Calendar services for your users. For details, go to: Control Gmail access for your organization’s users Turn Calendar on or off for users If the error persists, wait for a few hours before trying the migration again.
Mail service not enabled for source user The source email address is invalid	Confirm that the Microsoft Exchange Online source account in your list of source users is correct. Confirm the Microsoft Exchange Online source account in your identity map is correct. Confirm the options in Map identities that aren't included in the identity maps, but discovered during the migration are correctly selected. Ensure that the source user has the correct licenses assigned in Microsoft and is able to access their mailbox.
Google Calendar Service is disabled for the target user	Turn off the Calendar service for your users. For details, go to Turn Calendar on or off for users.

Logs message

How to fix

User not found

Set up a Google Workspace account for the user if they don’t already have one.
Turn on the Gmail and Calendar services for your users. For details, go to:
- Control Gmail access for your organization’s users
- Turn Calendar on or off for users
If the error persists, wait for a few hours before trying the migration again.

Mail service not enabled for source user

The source email address is invalid

Confirm that the Microsoft Exchange Online source account in your list of source users is correct.
Confirm the Microsoft Exchange Online source account in your identity map is correct.
Confirm the options in Map identities that aren't included in the identity maps, but discovered during the migration are correctly selected.
Ensure that the source user has the correct licenses assigned in Microsoft and is able to access their mailbox.

Google Calendar Service is disabled for the target user

Turn off the Calendar service for your users. For details, go to Turn Calendar on or off for users.

For other errors, check the general troubleshooting help for Data Migration Service (New) email migrations.

Error uploading migration maps

When you upload your migration or identity map, you may see one of the following errors in the bottom left corner or under Tasks .

Error message	Steps to troubleshoot
Internal error occurred while adding this entry	Confirm the CSV headers are correct. Learn how to download an example at Where do you want to copy emails from.
Invalid CSV file	Confirm the CSV headers are correct. Learn how to download an example at Where do you want to copy emails from.
Source Entry is already mapped	A source email address was added more than once in your identity map. Check for duplicate source users. Note that target users can be listed more than once.
Entry already exists	A source email address was added more than once in your migration map. Check for duplicate source users.
Source and target identity for all entries must be valid email	Confirm all emails are the correct format (example: [email protected]).

Migration fails to start

Make sure that a target domain super admin starts the migration. The new data migration service requires super admin privileges as it grants domain-wide delegation in the target domain before it begins to migrate data.

Migration completes, but there are failed items

Click Export migration report, then use the report to identify items that didn't migrate and why. For details, go to Understand the new data migration service reports.

Once you’ve identified the issues, run a delta migration.

Error migrating folders

Sometimes messages present in a folder migrate in a warning state. They will not have the label that corresponds to their folder attached.

To troubleshoot, try running a delta migration. If the issue persists, you can:

Fix the issue with the label: To troubleshoot the label, go to Understand the new data migration service reports.
Remove the label

Then run a delta migration again.

Was this helpful?

How can we improve it?