A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi Jim,
Thanks for posting the question on our forum.
Per your description, the issue occurs when you install add-in on Microsoft Store.
I suggest you try online repair to check if it can repair Office client and provide the result:
Besides, you can also refer to the following article to check if it can help you:
Troubleshoot user errors with Office Add-ins
If the issue still exists, could you please provide the following information for further analysis?
- The version of Excel. (Click File>select Account)
- The screenshot of error message.
- Did you meet the error message when you use the add-in or add the add-in?
- Check if all add-ins meet the issue.
Regards,
Qing