Solution for We could not copy this sheet in excel problem

Try the fix that matches the Excel version and scenario:

1. If using Excel for Mac and copying a worksheet in the same workbook
   • Hold down OPTION.
   • Drag the sheet tab to the location where the copy should appear.
   • Release the mouse button before releasing OPTION.
2. If copying a sheet to another workbook in Excel for Mac
   • Open both workbooks.
   • Select the sheet to copy.
   • Go to Edit > Sheet > Move or Copy Sheet.
   • In To book, select the destination workbook.
   • In Before sheet, choose the insertion point.
   • Select Create a copy.
   • Select OK.
3. If using Excel for the web
   • Right-click the sheet tab and select Duplicate.
   • If duplication fails because the sheet contains a chart, picture, or shape, copy the sheet manually:
     • Select all data with CTRL+Spacebar, then Shift+Spacebar.
     • Press CTRL+C.
     • Add a new blank worksheet with the + button.
     • Select the first cell and press CTRL+V.
   • Note: conditional formatting is lost when pasting into the new sheet.
4. If worksheet commands are grayed out
   • Check whether the workbook structure is protected.
   • In Excel, go to Review > Protect Workbook.
   • If Unprotect Workbook appears, select it.
   • Or check File > Info > Protect Workbook and turn off Protect workbook structure.
   • When workbook structure protection is enabled, Excel disables Insert sheet, Delete, Move or Copy, Rename, Hide, and Unhide.
5. If this started after an Excel update and paste/copy behavior is failing
   • There is a documented known issue affecting some Excel versions after the September 2026 Excel security update, where paste can fail without an error.
   • A temporary workaround mentioned is to have IT roll Office back to an earlier unaffected build.
   • Warning: rolling back Office can remove recent security fixes, so this should be reviewed by IT.
   • Otherwise, install the next Office update that contains the fix and test again.
6. If using Excel 2016 preview version 16.0.4229.1002
   • This specific build had a bug where copying a sheet moved it instead of duplicating it.
   • The fix was to uninstall the preview version and install a released RTM version of Office, then enable automatic updates.

If the exact error is “We could not copy this sheet”, the most practical checks are:

• use the correct copy method for the Excel version,
• verify workbook structure protection is off,
• if on Excel for the web, duplicate or manually copy the sheet,
• if the issue began right after an update, check for the known update-related issue.

• Move or copy a sheet in Excel for Mac
• Move or copy worksheets or worksheet data
• Why would I not be able to add a worksheet to an Excel file? - Microsoft Q&A
• Excel Copy / Paste not work - Microsoft Q&A
• Unable to copy or move sheet in Excel 2016 (16.0.4229.1002)