MC1169914 – M365 Change Digest

One-line summary

Some organizations received incorrect Windows 10 ESU MAK keys marked 'DO NOT USE'; new keys will be issued by October 13.

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Details

Body (from Message Center)

Some organizations might have received incorrect Multiple Activation Keys (MAK) for Windows 10 Extended Security Update (ESU) activation. These keys are visible in the Billing section, under Your products page, and then the Volume licensing tab.

Incorrect MAKs will be prefixed with the sequence ***DO NOT USE*** followed by a number. ESU keys without this sequence are not affected by this issue.

You should receive a new key by Monday, October 13. If you do not receive a new key by end of day Monday, please open a support ticket for quick resolution by visiting https://learn.microsoft.com/microsoft-365/commerce/licenses/contact-vl-support?view=o365-worldwide

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{
  "snapshot_item": {
    "action_required_by": null,
    "ai_action_required_by": null,
    "ai_actions": [
      "Check for new ESU MAK keys",
      "Do not use keys marked \u0027DO NOT USE\u0027",
      "Open support ticket if new key not received by October 13"
    ],
    "ai_master_tags": [],
    "ai_model": "gpt-4.1",
    "ai_summary": "Some organizations received incorrect Windows 10 ESU MAK keys marked \u0027DO NOT USE\u0027; new keys will be issued by October 13.",
    "ai_topics": [
      "Windows"
    ],
    "category": "stayInformed",
    "details_map": {},
    "id": "MC1169914",
    "importance": 0,
    "is_major_change": false,
    "last_modified": "2025-10-11T01:17:08Z",
    "ms_products": [
      "Windows"
    ],
    "platforms": null,
    "roadmap_ids": [],
    "services": [
      "Windows"
    ],
    "severity": "normal",
    "tags": [
      "Admin impact"
    ],
    "title": "Activation keys for Windows 10 Extended Security Update might be incorrect"
  }
}