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Fix Google Workspace Mail Migration Password Credential Error in Microsoft 365
Question details
The user is encountering a password credential error for a single Google Workspace account during an email migration to Microsoft 365, despite having the correct app password.
- Product
- Microsoft 365 Exchange Migration
- Device & OS
- not provided
- Scenario
- Migrating a batch of email accounts from Google Workspace to Microsoft 365 using the Exchange admin center.
- Observed behavior
- One specific account fails to migrate and displays a password credential error, while other accounts in the same batch migrate successfully.
Ensure you have administrative access to both your Google Workspace admin console and the Microsoft 365 admin center, and have your Google app passwords ready for verification.
Verify and Regenerate Google App Password
Generating a fresh app password ensures there are no hidden typos or expired credentials causing the synchronization failure.
Even if you believe the password is correct, security policies or input errors can sometimes invalidate an app password. Regenerating it for the specific affected account can quickly resolve isolated credential issues.
Sign in directly to the affected Google Workspace account. Click on the profile icon, navigate to 'Manage your Google Account', and select the 'Security' tab.
Scroll to '2-Step Verification', find the 'App passwords' section, and generate a new 16-character password specifically for the Microsoft migration.
Return to the Microsoft 365 Exchange admin center, update the specific user's migration credentials with the newly generated app password, and resume the migration batch.
Contact Microsoft 365 Business Support
If the issue is isolated to a single account despite correct credentials, backend intervention from Microsoft is required.
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Frequently Asked Questions
Why do I need an App Password for Google Workspace migration?
Google requires App Passwords for third-party applications (like Microsoft 365) to connect via IMAP when Two-Step Verification is enabled on the Google Workspace account.
What if IMAP is disabled for the affected Google Workspace account?
If IMAP is disabled, the Microsoft 365 migration tool cannot access the mailbox. Ensure that IMAP access is enabled in the Gmail settings for that specific user under the 'Forwarding and POP/IMAP' tab.
Can I migrate Google Workspace to Microsoft 365 without app passwords?
Yes, but you must use the newer Automated Exchange Online Migration tool that uses Google Workspace service accounts and OAuth authorization instead of individual IMAP app passwords.
