Cannot enter data into Excel

This behavior matches reduced functionality mode or a worksheet/input restriction in Excel for Mac.

Try these checks in order:

1. Confirm whether Excel is in reduced functionality mode
   • On macOS, starting July 13, 2026, Office apps can open and print files but cannot edit, save, or create new files when they enter reduced functionality mode.
   • That fits the symptom of being able to open files and save a new workbook name, but not enter content.
2. Check whether the worksheet is protected
   • In Excel, go to the Review tab.
   • Look for Unprotect Sheet in the Changes group.
   • If the sheet is protected, locked cells can be selected but not edited.
   • If a password was used, that password is required to unprotect it.
   • Since the issue also happens in a brand-new workbook, worksheet protection is less likely, but it is still worth confirming.
3. Remove old Office license information from the Mac and reactivate Excel
   • A Microsoft Q&A resolution for this Mac scenario recommends completely removing the old Office license information from the Mac and then reactivating.
   • Use the Microsoft support article referenced in that resolution: https://support.microsoft.com/microsoft-365-activation-licensing/how-to-remove-office-license-files-on-a-mac
4. Make sure the Microsoft Office Licensing helper is enabled
   • On Mac, go to Apple icon > System Settings > General > Login Items.
   • Verify Microsoft Office Licensing is turned on.
   • A reported Mac case with “Unable to connect to the licensing helper” could not save data until this was enabled.
5. If Excel still will not accept typing, test whether the Mac user profile is the issue
   • Microsoft lists a corrupted user account profile as one possible cause of Excel problems on Mac.
   • Create a new macOS user account and test Excel there.
   • If Excel works in the new account, the issue is likely tied to the original macOS profile.
6. If needed, repair disk permissions
   • Open Go > Utilities > Disk Utility.
   • Select the primary hard disk.
   • Open the First Aid tab.
   • Select Repair Disk Permissions.
   • This is intended to troubleshoot permissions problems.

The strongest match here is the licensing state specific to Excel on the new Mac, especially because Word works but Excel cannot accept edits.

References:

• Fixes or workarounds for recent issues in Excel for Mac
• Enter data manually in worksheet cells
• How to reactivate/return functionality for Excel in Office365? - Microsoft Q&A
• Unable to connect to the licensing helper - Microsoft Q&A
• "Microsoft Excel has encountered a problem and needs to close" when starting Excel for Mac