A Microsoft file hosting and synchronization service.
Hello David Holley,
I understand how disruptive this is, especially when the Excel-to-Word links previously updated automatically.
A linked Excel object in Word stores the location of the source workbook. If OneDrive changes how that location is resolved, Word may no longer be able to find the source and can display “Error! Not a valid link.” However, I could not find an official Microsoft notice confirming this specific behavior as a known OneDrive bug or providing a date for a fix.
Please try the following:
- Make sure both files are fully downloaded to the computer and available offline, rather than shown as online-only OneDrive files.
- Open the Excel workbook first, and then open the Word document.
- In Word, select File > Info > Edit Links to Files, if that option is available.
- Select the affected Excel link, choose Change Source, and select the current Excel workbook from its OneDrive-synced folder.
- Choose Update Now, save the Word document, close both applications, and test again.
If Edit Links to Files is unavailable or the repaired link breaks again, create a small test workbook and Word document in the same OneDrive folder and recreate the link using Paste Special > Paste Link > Microsoft Excel Worksheet Object. This can help determine whether the issue affects the existing documents specifically or all linked files in the OneDrive location.
Moving the files outside OneDrive can be used as a temporary diagnostic test, but I agree that it is not an ideal permanent solution. If the behavior also occurs with newly created files, please report it through Word > File > Feedback and contact Microsoft Support so they can collect the Office build information and diagnostic logs. Microsoft Q&A community contributors do not have access to Microsoft’s internal investigation or release schedules.
Feel free reply back to this post if you need further assistance, I'll be happy to help.