Google Drive Migration Service Not Available

Question

Google Drive Migration Service Not Available

Harpreet Singh 5

I have got an error when trying to perform a Drive migration in the SharePoint admin center. I have all the correct permissions in both the Google and Microsoft environments, but after installing the M365 migration app in the Google workspace, I am unable to proceed. It is unable to Generate the Link for Authenticate Google Workspace.

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Answer 1

Nam-D 3,395 Microsoft External Staff Moderator

Hello @Harpreet Singh,

To better narrow down the issue, could you please help confirm the following:

What exactly happens when you click “Generate Link”?

Does nothing happen?
Does it keep loading?
Or do you receive any specific error message?

If possible, please share:

A full screenshot of the page,
The exact error message (if any).

Please also confirm:

Whether the Microsoft 365 account used is a Global Administrator, SharePoint Administrator, or Migration Administrator
Whether the Google account used for authentication is a Google Workspace admin account

Have you already tested the same behavior in:

InPrivate/ Incognito mode
A different browser
Or a different device/ network?

This will help determine whether the issue is related to the browser/ authentication flow or the migration connector itself. Before sharing the screenshot, please make sure to blur all personal information. Looking forward to your response.

Harpreet Singh 5 Reputation points

2026-03-27T11:02:36.98+00:00

Hi, Thank you for the response, Below screenshot for your reference and we have tested it on different browsers and inPrivate/Incognito mode.
Nam-D 3,395 Reputation points Microsoft External Staff Moderator

2026-03-30T07:49:48.9033333+00:00
Hello @Harpreet Singh,

Thank you for the update and for sharing the screenshot.

Since the page is getting stuck at “Generating authentication link…” even after testing in different browsers and InPrivate/ Incognito mode, this looks less likely to be a browser issue and may be related to the Google Workspace connection/authentication flow itself.

To help narrow it down, could you please confirm the following:

The Microsoft 365 account being used is assigned one of these roles:

Global Administrator

SharePoint Administrator

Microsoft 365 Migration Administrator

The Google Workspace account used to install/authenticate the Microsoft 365 migration app has a supported admin role (for example, Super Admin)

Workspace, then retry the connection again right away.

Microsoft also notes that the authentication flow should be completed within 10 minutes, otherwise the session may expire:

Connect to Google with Migration Manager - Migrate to Microsoft 365 | Microsoft Learn

Overview: Migrate Google Workspace to Microsoft 365 with Migration Manager - Migrate to Microsoft 365 | Microsoft Learn

Microsoft 365 Migration Admin role - Migrate to Microsoft 365 | Microsoft Learn

If you have already verified the roles above and reinstalled the migration app but the issue still remains, I would recommend raising a Microsoft 365 support ticket for further investigation, as this may require backend review of the Migration Manager connection process. You can follow the steps in this document: Get support - Microsoft 365 admin | Microsoft Learn
Nam-D 3,395 Reputation points Microsoft External Staff Moderator

2026-03-31T07:56:41.2266667+00:00

Hello @Harpreet Singh,

May I know if you have got any chance to check my answer? I am glad to help if you have any other questions.
Harpreet Singh 5 Reputation points

2026-04-01T11:35:41.83+00:00

Hi The user has assigned Global Admin Role and we have create the spare VM and test it on that also we are getting the same error and we are able to test with Contoso Tenant it is working fine. Thanks
Nam-D 3,395 Reputation points Microsoft External Staff Moderator

2026-04-01T12:40:15.3966667+00:00

Hello @Harpreet Singh,

Thank you for confirming.

Since:

- the affected user already has the Global Administrator role,

- the same behavior occurs even when tested from a separate VM, and

- the same Google Workspace migration flow works successfully in a different tenant,

this points more toward a tenant-specific issue rather than a browser, device, or general configuration problem.

At this stage, I would recommend raising a Microsoft 365 support ticket so the support team can further investigate the backend migration connection for the affected tenant.

Please refer to the following support options:

- Microsoft 365 Admin Center > Help & support

- Or follow this document: Get support - Microsoft 365 admin

I hope this helps point you in the right direction.

Answer 2

Use Migration Manager’s documented connection flow to unblock the “Authenticate Google Workspace” step and ensure all prerequisites are met.

Verify admin roles and access
- In Microsoft 365, sign in with one of these roles on the target tenant:
  - Global admin
  - SharePoint/OneDrive admin
  - User assigned the Microsoft 365 Migration Administrator role.
- In Google Workspace, sign in with a supported admin account when installing and authorizing the app:
  - Super admin, Groups admin, User management admin, or Help desk admin.
Re‑run the connection flow from Migration Manager
- Go to Microsoft 365 Admin Center → Setup → Migration and imports and choose Google Drive or Google Workspace to open the migration project.
- In the SharePoint Admin Center, under Migration → Google Workspace, select Get started (or open the existing project) and then Connect to Google Workspace.
- On Install the migration app, select Install and authorize and complete the Google Workspace Marketplace flow as an admin (Domain/Admin install, accept terms, Allow, Finish).
- Return to the Migration page and select Next.
- Select Sign in to Google Workspace to generate and use the authentication link.
Respect the 10‑minute security window
- The connection session has a 10‑minute timeout. If there is more than 10 minutes of inactivity between opening the connection step and completing sign‑in/authorization in Google, the session expires and the link may fail to generate or work.
- If this happens, close the flow and start Connect to Google Workspace again, then complete all steps promptly.
Confirm the Microsoft 365 Migration app is correctly installed in Google
- In the Google Admin Console, verify that the Microsoft 365 migration app appears as a domain‑installed app and is not blocked.
- If in doubt, remove it and repeat the Install and authorize flow from Migration Manager so the app is reinstalled and authorized for the whole domain.
After successful connection
- For standard Migration Manager, once the Google Workspace connection is established, the wizard automatically moves to Configure project settings. If configuration isn’t needed, choose Skip and finish, then proceed to Step 2: Scan and assess.

If the link still cannot be generated after confirming roles, reinstalling the app, and completing the flow within 10 minutes, repeat the connection process from a different browser or network and ensure no pop‑up blockers or script blockers interfere with the Google sign‑in window.

References:

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Google Drive Migration Service Not Available

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