Office 2024 Activation accepted code and now does not

Question

Office 2024 Activation accepted code and now does not

Diether Cooke 0

I had office 2021 on pc but updated to Microsoft Office LTSC Professional plus 2024 it accepted my activation code in outlook, then I tried to use word and it asked again but would not accept the code, now outlook says its 2019 and needs activating but says code is used up.

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Answer 1

Hi Diether,

Unlike Office Home, Office Home & Business, or Microsoft 365 products intended for individual users, Office LTSC Professional Plus 2024 is a volume-licensed edition primarily intended for organizations and is typically deployed using the Office Deployment Tool (ODT).

Based on your description, Outlook is now identifying itself as Office 2019 even though you attempted to upgrade from Office 2021 to Office LTSC Professional Plus 2024. This may indicate that the LTSC 2024 installation did not complete correctly, or that components from a previous Office installation are still present.

It is recommended to remove existing Office versions before deploying Office LTSC 2024 to help avoid version and licensing conflicts.

You may try the following steps:

1/ Uninstall Office

Follow the guidance in this article to remove current Office: Uninstall Microsoft 365 or Office from a PC

2/ Restart the PC when prompted.

3/ Reinstall Office LTSC Professional Plus 2024

Reinstall Office LTSC Professional Plus 2024 from your original installation source, or follow the guidance in: Deploy Office LTSC 2024.

If the same issue occurs after reinstalling Office LTSC Professional Plus 2024, the problem may be related to the product key or activation method rather than the Office installation itself. Since Office LTSC Professional Plus 2024 is a volume-licensed product, you may need to contact your administrator or vendor who provided the license to verify that the key is valid, matches the installed edition, and has available activations remaining.

If you are unsure who your IT administrator is, you can refer to this official Microsoft guide for assistance: How do I find my Microsoft 365 admin? - Microsoft Support.

I hope this information is helpful.

Diether Cooke 0 Reputation points

2026-09-18T07:00:23.5366667+00:00

I tried thia multiple times and the only version on my laptop is the 2024 version all others have been removed before a clean install.
Lin v 1,375 Reputation points Independent Advisor

2026-09-18T16:15:37.4133333+00:00

Hi Diether,

Thank you for the update.

At this point, I'd be more concerned about the activation itself. Office LTSC Professional Plus 2024 is a volume-licensed product, and activation depends on the licensing method and key assigned to that edition.

Because the product key was initially accepted but is now reported as already used, I recommend contacting the vendor or licensing administrator who provided the key and asking them to verify:

Whether the key is intended for Office LTSC Professional Plus 2024.

Whether the key has any remaining activations available.

Whether the key has been blocked, replaced, or otherwise invalidated.

Hopefully this issue will be sorted out soon.