2026-10 Preview Update (KB5127936) (26300.9818)

Elchin Damirov 0 Reputation points
2026-11-05T15:30:19.6866667+00:00

Hello. Camera suddenly stoped working. There is voice but not video. Updates not completing.

Microsoft Teams | Microsoft Teams for business | Meetings and calls | Audio and video
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  1. Lin V 1,955 Reputation points Independent Advisor
    2026-11-05T16:00:48.03+00:00

    Hi Elchin,

    To help narrow this down, kindly provide a few additional details:

    • Is this a built-in camera or an external webcam?
    • When you try to use the camera, do you see a black screen, a frozen image, or no camera detected at all?
    • Does the issue occur in all meetings/calls, or only in a specific meeting?
    • Can you see your own video preview, or is the preview blank as well?
    • When the update does not complete, do you receive any error message or error code?

    In the meantime, you can consider the steps outlined in the AI answer, as they appear to be appropriate troubleshooting steps for isolating whether the issue is related to the camera device, application settings, or the update process.

    Feel free to reply back with additional details and your answers to the questions above if you need further assistance, so that the community can better understand the situation and help troubleshoot more efficiently.

    I look forward to your update.

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  2. AI answer

    2026-11-05T15:31:45.09+00:00

    There is no documented KB5127936 known issue for Teams video failure, so first test the Windows Camera app to determine whether the fault is Windows-wide or limited to Teams, and troubleshoot the incomplete Windows update separately.^1^

    1. Determine the scope

    Open Start → Camera.

    • If a live picture appears: the camera and Windows driver are functioning; continue with the Teams-only steps below.
    • If there is no picture or an error appears: skip to the Windows camera steps.

    This distinction prevents unnecessary Teams repair when the camera is unavailable throughout Windows.^2^

    2. If the camera works in Camera but not Teams

    1. In Teams, open Settings → Devices and select the intended camera.
    2. Under Audio settings, select Make a test call. This test is unavailable in Teams on the web.
    3. Close applications that could be holding the camera, such as another Teams window, Zoom, Skype, OBS, or browser meeting tabs.
    4. Open Windows Settings → Privacy & security → Camera and turn on:
      • Camera access
      • Let apps access your camera
      • Let desktop apps access your camera
      • Microsoft Teams (work or school), if it is listed
    5. Completely exit Teams, reopen it, and repeat the test call.

    These are Microsoft’s documented Teams camera checks.^3^

    As a temporary workaround, join the meeting through Teams on the web. The browser must also have camera permission.

    3. If the camera also fails in the Windows Camera app

    1. Go to Settings → System → Troubleshoot → Other troubleshooters.
    2. Find Camera and select Run.
    3. Open Device Manager, then expand Cameras, Imaging devices, or Sound, video and game controllers.
    4. Right-click the camera → Properties → Driver.
    5. Because the failure began after an update, select Roll Back Driver if available, restart Windows, and test Camera again.
    6. If rollback is unavailable, use Action → Scan for hardware changes. Check Settings → Windows Update → Advanced options → Optional updates for a camera-driver update.

    If an external webcam is involved, reconnect it through another USB port before changing its driver. Microsoft also documents driver rollback and reinstallation for cameras that stop working following an update.^2^

    4. Repair the incomplete Windows Update

    Treat this as a separate issue unless an error code identifies a connection:

    1. Open Settings → System → Troubleshoot → Other troubleshooters.
    2. Next to Windows Update, select Run.
    3. Restart the computer when the troubleshooter completes.
    4. Return to Settings → Windows Update → Check for updates.

    The Windows Update troubleshooter performs the supported automated diagnostics for download and installation failures.^4^

    Record the exact update error code if installation still fails. Codes such as 0x80073712, 0x80070005, and 0xC1900101 require different repairs, so “not completing” alone is insufficient to select the next safe action.

    5. Conditional rollback of KB5127936

    Only test removal if all three conditions apply:

    • Camera worked immediately before KB5127936.
    • It fails in the Windows Camera app, not only Teams.
    • Permissions and the camera driver steps above do not restore it.

    Go to Settings → Windows Update → Update history → Uninstall updates, select KB5127936, and choose Uninstall, then restart and test Camera. Some updates cannot be removed.^5^

    KB5127936 is a preview cumulative update for Windows 11 versions 25H2 and 26H2, builds 26200.9818 and 26300.9818. Its published known issue concerns certain USB Audio Class 1.0 devices—not Teams cameras—so rollback is a diagnostic fallback rather than a confirmed fix.^6^

    If this affects multiple managed PCs, collect the Camera-app result, camera model/driver version, Teams version, and Windows Update error code, then open a Microsoft 365 support request.

    References

    1. October 28, 2026— KB5127936 (OS Builds 26300.9818 and 26200.9818 ...
    2. Windows 11
    3. My camera isn't working in Microsoft Teams | Microsoft Support
    4. Windows 11
    5. Windows 11
    6. October 28, 2026— KB5127936 (OS Builds 26300.9818 and 26200.9818) Preview | Microsoft Support
    AI-generated content may be incorrect. Read our transparency notes for more information.

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