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Hi Allen,
To help narrow down the cause, kindly provide a few more details:
- Which version of Excel are you using (Microsoft 365 Apps, Office 2024, Office 2021, Office 2019, etc.)?
- What exactly happens when you try to copy and paste?
- When did the issue start?
- Did the problem begin after a recent Office update?
In the meantime, there was a known issue reported in September 2026 where copy and paste operations in Excel could fail after certain Office security updates. Symptoms included copied cells remaining selected while paste would not work and no error message was displayed.
Microsoft has since released fixes through newer Office updates, so if your Excel version falls within the affected versions (Excel 2016, 2019, 2021, or 2024), you may want to review the following article and ensure the latest updates are installed: The paste operation might fail with no notifications in Excel.
According to the article, the issue has been fixed in newer builds, but the fix may not be applied automatically until the latest Office updates are installed.
If the issue persists after confirming Office is fully updated and the behavior does not match the known issue described above, you may also try starting Excel in Safe Mode, temporarily disabling add-ins, or testing copy and paste in a new blank workbook to help determine whether the problem is related to the Office installation, a specific workbook, or an add-in conflict.
Feel free to let me know if you need further assistance after applying the steps above.