14 September 2026, by RRZ-ServiceLine

Update 24.09.2026 - 10:30:
The problem has been resolved by Microsoft releasing the relevant updates. If the updates have not been installed automatically on your system and the problem persists, you can force the update. In Excel, click on:

"File" -> "Account" -> "Office Updates/Update Options" -> "Update now". You may then need to restart the device, or doing so may help.

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Update 21.09.2026 - 13:30 Uhr
As confirmed by Microsoft, the issue described in Excel still persists when ‘conditional formatting’ is used in the document.
Microsoft is working on a solution.

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Update 18.09.2026 - 10:40:
The problem has been resolved by Microsoft releasing the relevant updates. If the updates have not been installed automatically on your system and the problem persists, you can force the update. In Excel, click on:

"File" -> "Account" -> "Office Updates/Update Options" -> "Update now". You may then need to restart the device, or doing so may help.

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Following a Microsoft update, errors are currently occurring when attempting to copy and paste content.

Microsoft added the error to its update description on 10 September and is still investigating the cause. Excel 2016, 2019, 2021 and 2024 are affected.

See, for example:

https://www.notebookcheck.com/Excel-2016-bis-2024-Das-September-Update-bricht-Kopieren-und-Einfuegen.1398871.0.html

https://learn.microsoft.com/en-us/answers/questions/5998790/ctrl-c-and-ctrl-v-not-working-in-excel-after-updat

As a temporary workaround, you can paste the contents of the copied cell by right-clicking and selecting ‘Paste Values’

Microsoft is treating this widespread error as a high-priority incident and is continuing to work on a solution. As soon as the manufacturer has provided a permanent fix, we will inform you immediately.

We apologise once again for any inconvenience this may cause.