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Summary
Remediations can be run against a group of devices to perform an action, but can also be run on a specific computer. The Windows Activation Remediation should run on each device when it goes through the Autopilot process to activate the device, however there is a chance that a device may get through without being activated. In this case, take the following steps.
How-To
Task: Run Activation Remediation to resolve device that is not activated
Instructions
Step 1 - Find the device in Intune.
Browse to https://intune.microsoft.com
Click on Devices on the left-hand side, then Windows.

Step 2 - Type the Device Name or serial in the search, then click on the Device Name.

Step 3 - On the far-right side of the Device Overview page, click the 3 dots and choose Run Remediation.

Step 4 - Choose Activation Remediation, and click Run Remediation.

Step 5 - Browse back to the Device Overview Page, run a Sync and monitor the remediation action.

Step 6 - Action status will say "Complete" when finished.
Outcome
The remediation process has been successfully finished.