A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
Hi,
My name is Naval and I am an Independent Advisor. I would like to help you.
Co-authoring with SharePoint, OneDrive, and Office is on by default, but there are situations that can block or prevent you from co-authoring with others.
Please read this Microsoft article to troubleshoot co-authoring in Office.
https://support.office.com/en-us/article/troubl...
Hope this information helps. Please post if you need any further assistance.