A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Hello @Vibilu Balan, @Dodo ,
A known issue has been confirmed by Microsoft in the September 2026 Excel security update. According to the published advisory, paste operations may fail silently in Excel 2016, Excel 2019, Excel 2021, and Excel 2024, which matches the behavior you described where copy appears to succeed but paste does not complete. Microsoft is currently investigating the issue.
As this is a known issue associated with the update, it appears to be related to the Windows/Office update interaction rather than a problem with your Office installation itself.
At this time, the available workaround is to roll back to a Windows version prior to the update where the issue was introduced, if this is permitted within your environment, and monitor Microsoft's advisory for further updates and a permanent fix.
For detailed instruction, please check: Go back to the previous version of Windows | Microsoft Support
Alternatively, I recommend waiting for upcoming Microsoft updates, as Microsoft is actively investigating the issue and may provide a fix in a future update.
I hope this information helps.