Can not install SPMT (share point migration tool)

Nick 5 Reputation points
2026-10-30T16:19:13.5633333+00:00
  • The three URLs that fail with ContainerNotFound: spmt.sharepointonline.com/install/default.htm, /spmtinstaller/spmtbuild/publicpreview/spmtsetup_beta.exe, and /mmagent/agentsetup.exe.
  • The installer error: 0x08000301, “Web failures encountered when downloading remote builds” (404 Not Found).
  • The RequestId and timestamp from one of the error pages, such as RequestId [Moderator note: Personally Identifiable Information removed] at 2026-10-30 16:03 UTC from the Migration Manager agent page. Microsoft can look these up in their logs.
  • A note that both SPMT and the Migration Manager agent are affected, so you can’t migrate a file share to OneDrive.
Microsoft 365 and Office | SharePoint | For business | Windows
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  1. Hendrix 2,690 Reputation points Independent Advisor
    2026-10-30T17:25:43.8133333+00:00

    Hi Nick,

    Thank you for providing the error details.

    Based on what you shared, multiple Microsoft-hosted download locations are returning 404 Not Found / ContainerNotFound, including the locations used by both the SharePoint Migration Tool (SPMT) and the Migration Manager agent. As a result, the required installation files cannot be downloaded.

    Since both installation methods are failing at the Microsoft-hosted endpoints, in this case, the best next step is to contact Microsoft Support directly. You can ask your administrator to raise a support ticket with Microsoft Support through the Microsoft 365 Admin Center for deeper investigation. They have access to backend configurations and can perform a more in-depth investigation. At the very least, they can provide the most effective workaround to ensure your experience remains smooth and secure.    

    I hope this information helps move the case forward. Should you have any further questions or need additional assistance, please feel free to share them in the comment below. I'm very happy to help.

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  2. AI answer

    2026-10-30T16:20:14.84+00:00

    Because both Microsoft-hosted SPMT and Migration Manager installer resources return ContainerNotFound/HTTP 404, check Microsoft 365 service health and open a support request if the current official download paths reproduce the failure.

    1. Retry only through the current official installation paths

    Do not reuse the direct spmtsetup_beta.exe, agentsetup.exe, or previously downloaded setup files.

    SPMT

    1. Open the official SPMT installation page.
    2. Select General Availability → Install here. Use Public preview only as an alternative.
    3. Confirm whether the newly generated download still ends with error 0x08000301 and HTTP 404.

    Microsoft currently publishes separate General Availability and public-preview installation links on that page.^1^

    Migration Manager agent

    1. Sign in to the SharePoint admin center as a SharePoint Administrator.
    2. Go to Migration center → For file shares → Get started → Agents → Add.
    3. Select Download agent setup file.
    4. Run that newly downloaded setup file rather than an older copy. Microsoft specifically identifies an outdated agent setup file as a cause of agent installation failures.^2^
    5. Confirm whether this portal-generated download also returns ContainerNotFound.

    That is the supported agent installation path.^3^

    2. Check and report Microsoft 365 service health

    In the Microsoft 365 admin center, go to:

    Health → Service health

    Review both Active issues Microsoft is working on and Issue history. If no relevant SharePoint migration incident appears, select Report an issue and describe that both SPMT and Migration Manager downloads are affected.^4^

    A 404 means that the requested server resource was not found; it is different from a normal Windows prerequisite or destination-permission error.^5^ The available information does not establish whether the missing resource is tenant-specific or a wider Microsoft service incident, so Microsoft must correlate the request in its service logs.

    3. Open a Microsoft 365 support request

    If both current installation paths still fail:

    1. In the Microsoft 365 admin center, select Help & support.
    2. Enter: SPMT and Migration Manager installer endpoints return ContainerNotFound / HTTP 404.
    3. If the suggested results do not resolve it, select Contact Support.
    4. Include:
      • SPMT error 0x08000301: “Web failures encountered when downloading remote builds.”
      • All three failing paths:
        • spmt.sharepointonline.com/install/default.htm
        • /spmtinstaller/spmtbuild/publicpreview/spmtsetup_beta.exe
        • /mmagent/agentsetup.exe
      • Request ID: [GUID]
      • Timestamp: 2026-10-30 16:03 UTC
      • Confirmation that a fresh SPMT link and a fresh agent download from the SharePoint admin center were tested.
      • Business impact: neither SPMT nor the Migration Manager agent can be installed, blocking the file-share-to-OneDrive migration.
      • Whether the same response occurs from another network.

    Microsoft documents the admin-center support-request procedure and requires a business-subscription administrator to submit it.^6^

    Conditional network check

    If the current links work from another network, inspect the original network’s proxy, firewall, DNS filtering, and TLS inspection. SPMT requires access to spmt.sharepointonline.com, spmtreleasescus.blob.core.windows.net, and the documented authentication, SharePoint, Blob Storage, and Queue Storage endpoints.^7^

    Migration Manager likewise requires spmt.sharepointonline.com for agent installation and auto-updating, together with its authentication, Blob, Queue, SharePoint, migration API, and SignalR endpoints.^8^

    If identical ContainerNotFound responses occur across independent networks, do not spend time reinstalling .NET or Visual C++ first; provide the correlation details to Microsoft Support for service-side investigation.

    References

    1. Step 1: Install the SharePoint Migration Tool (SPMT)
    2. Troubleshoot Migration Manager file migrations
    3. Step 1: Set up Migration Manager agents
    4. How to check Microsoft 365 service health
    5. HTTP 404 issue - Microsoft Q&A
    6. Get support for Microsoft 365 for business
    7. Prerequisites & Endpoints for the SharePoint Migration Tool
    8. Prerequisites & Endpoints for Migration Manager
    AI-generated content may be incorrect. Read our transparency notes for more information.

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