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“MDT task sequence creation failed” is a symptom, not one error with one fix. If the wizard says it cannot load a task sequence and the provider log mentions BDD_* WMI classes, repair the MDT Configuration Manager integration. If import fails with System.UnauthorizedAccessException, investigate the exact file operation, the identity performing it, and antivirus or endpoint-detection software before changing permissions broadly.
First note the complete error, the time it occurred, and the wizard step where it stopped. The steps below distinguish failures while creating the sequence from problems that happen later, during deployment.
Identify the failure before changing anything
The Configuration Manager MDT wizard does more than save a task-sequence name. It loads MDT templates and provider classes, substitutes selected images and packages, creates an MDT toolkit package, copies support files, and writes the task-sequence definition. A failure at any of those stages can produce a similar generic message. Microsoft describes the wizard and its package creation in its MDT integration guidance.
| What you see | Investigate first |
|---|---|
“An error occurred when loading the task sequence,” or provider errors involving BDD_UsePackage or other BDD_* classes |
MDT WMI/provider registration and Configuration Manager integration. Check TaskSequenceProvider.log. |
“Error while importing Microsoft Deployment Toolkit Task Sequence” with System.UnauthorizedAccessException or “Access denied” |
The precise source or destination operation, effective NTFS and share permissions, file locks, and antivirus/EDR events. |
| The wizard stops while loading templates, before copying or creating a package | Missing or damaged MDT extensions, WMI registration, installation state, or a mismatch between the console and provider environment. |
| The wizard reaches file or package creation, then fails | Package source and destination access, blocked or locked files, stale partial output, or a missing dependency. |
| An ordinary Configuration Manager task sequence works, but an MDT sequence does not | The MDT-specific integration, template, or file-copy path is more likely than the general task-sequence engine. |
| The MDT sequence was created successfully but fails on a target computer | This is a deployment-stage issue, not a creation failure. Start with deployment logs such as smsts.log; see Microsoft’s task-sequence debugging guidance. |
Keep the first exception and the operation immediately before it; later messages may only repeat the failure. A remote console can show a generic dialog while the useful provider-side evidence is on the site or provider server.
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For a task-sequence loading or BDD WMI error, reinstall the MDT extensions
Microsoft documents a specific case in which the MDT wizard fails after you select Finish because MDT BDD_* WMI classes are not correctly registered in the Configuration Manager site namespace. The documented remedy is to remove and reinstall the MDT console extensions—not to reinstall all of MDT, the ADK, and Configuration Manager at once. Follow Microsoft’s documented troubleshooting procedure:
- Close every Configuration Manager administrator console, including remote sessions.
- On the Configuration Manager server, open Microsoft Deployment Toolkit and run Configure ConfigMgr Integration.
- Choose Remove the MDT console extensions for System Center Configuration Manager and complete the wizard.
- Run Configure ConfigMgr Integration again, choose Install the MDT extensions for Configuration Manager, and complete the installation.
- Retry the MDT task-sequence wizard, then confirm that the new sequence opens and its referenced packages and images are valid.
Use this repair when the error and logs point to WMI or the MDT provider. If the retry instead fails during file copying with access denied, follow the access-denied checks below; it is a different failure stage.
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For import and access-denied errors, test the whole file operation
An access-denied exception is not proof that a share permission is the cause. A resolved user report described Configuration Manager 2211, MDT 8456, and a September 2023 ADK with an exception in MDT’s recursive copy routines; the reported cause was antivirus blocking file activity even though ordinary manual writes to the shares worked. That is a useful example, not evidence that antivirus is always responsible. See the reported case.
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Check the identity and both permission layers
- Identify which server-side process and account performs the failing operation. An administrator’s interactive access from another computer does not establish that the provider or server-side process has the same rights.
- For a UNC path, check both share permissions and NTFS permissions; the more restrictive effective access applies.
- Check access through every parent directory, as well as the source and destination folders. The relevant identity may need to traverse directories and create, modify, overwrite, rename, and remove files and folders.
- In a controlled test location, verify more than creating one text file: test the operations that failed, including rename and delete. Use a safe test item and clean it up.
- If practical in your environment, compare a controlled local path with the UNC path to help distinguish server-local access from network authentication or share access. This is a diagnostic comparison, not a recommendation to redesign package storage.
A blanket Full Control grant is not a sound first fix. Confirm the executing identity and the denied operation, then make the narrowest permission change that resolves a demonstrated access gap.
Check endpoint security and file state
- Record the failure time and the source and destination paths.
- Review Microsoft Defender or third-party antivirus/EDR detections, quarantine history, and behavioral-block events for that time. Ask the security team to check if you do not have access.
- If policy allows, run a short, controlled test with the relevant rule or path excluded, under security-team approval. Restore normal protection immediately after the test. Do not leave antivirus disabled as a workaround.
- Check whether the wizard left partial folders or files. Preserve the logs first; confirm no process is using the output, then rename or remove only the failed destination before retrying.
- Look for open handles, read-only attributes, files owned or created under a different account, and stale output from an earlier attempt.
Recursive copying can create a partly populated directory before one blocked file stops the operation. That pattern can resemble a permissions problem. A successful one-file write test does not rule out a blocked file, rename, overwrite, or delete operation.
Verify MDT integration, versions, and wizard inputs
Record the exact MDT version, Configuration Manager current-branch version, Windows ADK and WinPE add-on versions, Windows Server version, and whether you used a local or remote console. Also note whether the operation runs at a primary site, CAS, or administration workstation. Compatibility depends on the exact combination; old compatibility statements in general MDT documentation are not proof that a modern combination is supported.
- Confirm MDT is installed on the server where its Configuration Manager integration is being configured, and that the intended MDT console extensions are installed in the Configuration Manager environment.
- After an MDT or Configuration Manager upgrade, verify the integration rather than assuming the extensions remain correctly registered. Check for leftover extension versions.
- Check that the console is connected to the intended Configuration Manager environment and that the provider logs you inspect correspond to that site.
- Use the Configuration Manager console’s Create MDT Task Sequence wizard for MDT templates. Microsoft recommends using the wizard rather than manually importing MDT templates.
- Confirm that the selected operating-system image, boot image, and required packages still exist and are accessible; check their source paths and that none are orphaned.
- Verify the task-sequence ID is valid and unique, the intended template matches the deployment scenario, and the destination is not an inconsistent output from a previous failed attempt.
The documented Configuration Manager workflow is Software Library > Operating Systems > Task Sequences > Create MDT Task Sequence. Choose a template, provide the sequence details, select the required images and packages, and finish the wizard. A missing input or inaccessible dependency can surface as an import problem even when the WMI integration itself is healthy.
Use the log for the phase that failed
TaskSequenceProvider.log: Use for wizard-time provider or WMI failures. Look for missing or unloadableBDD_*classes and correlate entries with the failure time. Microsoft specifically identifies this log for its documented class-registration issue.- Configuration Manager console logs: Useful when the failure is launched from a remote console. They provide the client-side context; they do not replace the provider log for a server-side failure.
- Event Viewer and security-product history: Check relevant Configuration Manager/provider and WMI events, plus Defender or EDR blocks, around the same timestamp.
- Deployment logs: If the sequence already exists and fails while running on a device, switch to deployment troubleshooting and
smsts.log. The wizard-time provider log is not the sole log for a running deployment.
cmtrace.exe can make Configuration Manager logs easier to read. For a file-access investigation, Resource Monitor or Process Monitor may help identify a lock or denied operation. PowerShell file tests such as Test-Path, New-Item, Set-Content, Rename-Item, and Remove-Item can validate specific operations when run under the relevant identity and in a safe test directory. These are optional diagnostics; none is required for Microsoft’s GUI-based integration repair.
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Retry without losing evidence
- Save the full dialog text or a screenshot, relevant log excerpts, timestamp and time zone, and the paths involved.
- Fix only the branch supported by evidence: repair integration for WMI-class errors; investigate identity, permissions, endpoint security, and file state for copy failures.
- Before removing partial output, verify that it belongs to the failed attempt and is not in use. Preserve it if it may help diagnose the failure.
- Retry with the same inputs so the result tests the change. If the failure points to a dependency, verify it separately or try a minimal known-good set of inputs.
- After successful creation, open the resulting task sequence and validate its image and package references. Creation succeeding does not prove that a later deployment will succeed.
If you used Deployment Workbench instead
Deployment Workbench’s Lite Touch workflow and Configuration Manager’s MDT-integrated workflow are different. In Deployment Workbench, task sequences are created under a deployment share’s Task Sequences node using New Task Sequence. A failure there does not, by itself, call for repairing Configuration Manager’s MDT WMI extensions. Likewise, a deployment-share permission problem does not establish that Configuration Manager provider registration is broken. Microsoft’s MDT guidance covers the integrated workflow and its distinction from the standalone deployment-share process.
What to include when escalating
Give your Configuration Manager or endpoint-security team enough evidence to distinguish a provider failure from a blocked copy. Include:
- Exact error text, full exception or stack trace, wizard step, screenshot, failure timestamp, and time zone.
- MDT, Configuration Manager, ADK, WinPE add-on, and Windows Server versions.
- Site code, provider server, and whether the console was local or remote.
TaskSequenceProvider.logand relevant console-log excerpts from the failure window.- Source and destination paths, partial files or folders left behind, and the identity performing the operation.
- Relevant Defender or EDR events, including blocked or quarantined files.
- Whether a standard, non-MDT task sequence succeeds and whether the resulting MDT sequence opens after creation.
Reinstalling MDT and the ADK wholesale is a later escalation, not a default first step: it can change a working environment or introduce version drift without addressing a denied file operation. If the organization no longer needs MDT templates or scripts, a native Configuration Manager task sequence is an alternative design, but it requires replacing the MDT-specific functionality rather than merely bypassing this error.
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