Adding a Windows optional feature fails because source files are missing

Troubleshooting guideSources checked: 2026-09-05FaultNote editorial team

What to do first

Adding a Windows optional feature fails because source files are missing. The component store may lack the payload and cannot reach Windows Update, WSUS, or the specified repair source. Record the current state before changing it, use only the supported Windows path described below, and verify the same operation again after any required restart.

This is a general troubleshooting guide, not an announcement of a current outage.

Affected products and symptoms

Product: Windows optional features / DISM
Versions and conditions: Windows 11 (confirm the edition and hardware requirements for the feature)
Error codes and identifiers: 0x800f081f

Symptoms

Adding a Windows optional feature fails because source files are missing.
The same condition can persist after a retry or restart.

Causes and conditions

The component store may lack the payload and cannot reach Windows Update, WSUS, or the specified repair source.

Before you start

Save open documents and allow time for a Windows restart if required.
Run administrative actions only on a personally managed PC or with administrator approval.
Save the diagnostic command output so the before and after states can be compared.

Precautions

Do not bulk-delete registry entries, system folders, credentials, or storage metadata.
Do not run unofficial scripts or unknown drivers with administrator rights.

Windows optional features / DISM troubleshooting sequence: Distinguish a feature from a capability; Check the state with DISM; Repair through the supported path; Match the feature and repair source; Verify under the same conditions — Procedure overview created by FaultNote. Read the precautions and full instructions before changing settings. Read the full steps

Step-by-step instructions

01
Distinguish a feature from a capability
#
Record the feature name, the code such as 0x800f081f, and the Settings page that failed. DISM Get-Features lists Windows features; language packs and Features on Demand may use a different servicing mechanism. Do not guess FeatureName when the target is unclear.
02
Check the state with DISM
#
Record the exact feature name, Windows edition, version, build, and the organization's WSUS or repair-source policy.
Command or path
```
DISM /Online /Get-Features /Format:Table
```
03
Repair through the supported path
#
Check Windows Update reachability and component-store health first. Use only official media matching the installed Windows build, language, and edition as a repair source.
Command or path
```
DISM /Online /Cleanup-Image /ScanHealth
```
04
Match the feature and repair source
#
On a managed PC, provide IT with the feature name and DISM log location C:\Windows\Logs\DISM\dism.log and ask for the approved repair source. On a personal PC, do not use an ISO from another Windows release. In step 5, use the exact FeatureName from Get-Features and check for Enabled or a restart-pending state.
05
Verify under the same conditions
#
Replace FEATURE_NAME with the actual value for your system before using this example.
Run DISM /Online /Get-FeatureInfo /FeatureName:<FeatureName> and repeat the original operation once under the same conditions. If it succeeds, verify again after a restart and record the setting that changed.
Check that no new critical event with the same timestamp and component appears in Event Viewer.
Command or path
```
DISM /Online /Get-FeatureInfo /FeatureName:FEATURE_NAME
```

Check the result

The feature starts, connects, or completes without the original error.
The verification command reports the expected enabled, healthy, or connected state.
The result remains correct after a Windows restart and no new matching critical event appears.

If the problem continues

If the same code persists, provide the full message, Windows build, command output, and occurrence time to the PC administrator or Microsoft Support.
If hardware requirements, organization policy, or server settings are responsible, ask the owner to make the change instead of bypassing it on the client.

Scope of this guide

Troubleshooting guide — Restore the feature so it starts, connects, or completes normally and passes the same verification after a Windows restart.

Frequently asked questions

Can I use an ISO from another Windows version as Source?

No. A mismatched build, language, or edition can fail or create inconsistency.

Can a WSUS-managed PC bypass policy and contact Windows Update?

Follow organization policy. Give the administrator the feature name, 0x800f081f, and DISM logs to obtain an approved source.

Official sources and dates

Enable or Disable Windows Features Using DISM ↗

Source publication or resolution date: Not specified. Sources checked: 2026-09-05. The check date is not the date the problem first occurred. Interface labels can vary between versions and display languages.

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