MC1169914 Low
Activation keys for Windows 10 Extended Security Update might be incorrect
Summary AI-generated
Some organizations received incorrect Windows 10 ESU MAK keys marked 'DO NOT USE'; new keys will be issued by October 13.
Suggested actions AI-generated
- Check for new ESU MAK keys
- Do not use keys marked 'DO NOT USE'
- Open support ticket if new key not received by October 13
Written by Azure OpenAI (gpt-4.1) from the text of the post below. It can be incomplete or wrong; the original post is authoritative.
Similar posts
Search for more like this- MC1182993 Preparing commercial Windows 10 devices for ESUs
- MC1187343 (Update) New update to address issue affecting Windows 10 devices enrolled on Extended Security Updates (ESU)
- MC1184890 Take Action: Out-of-band update to address ESU enrollment issue on Windows 10, version 22H2 devices
- MC1274396 Extended Security Updates (ESU) available for Windows 10 Enterprise LTSB 2016
- MC1183612 Action Required to Enable Extended Security Update for local devices accessing Windows 365
- MC1187786 An updated version of the November 2025 Scan Cab is available
Original post from Microsoft
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