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Dear Natalie Griffin,
I understand that the Excel workbook is stored in SharePoint and that some users occasionally see it as Read-Only, while others are able to edit it normally.
Since the issue is intermittent, I’d like to narrow down whether this is related to the workbook itself, the SharePoint library configuration, or the Excel desktop client. Could you please check the following:
- When the issue occurs, can the affected user open the same workbook directly in Excel for the web and edit it successfully?
- Please confirm the affected user's Excel version and build number under File > Account > About Excel.
- Does this happen only with this specific workbook, or do other Excel files in the same SharePoint library also open as Read-Only?
- Please check whether the workbook is currently checked out to another user and whether Require Check Out is enabled for the SharePoint document library.
Normally, for a file stored on a SharePoint site, more than one person can work on it at the same time. This is called coauthoring. But if someone checks out the file from SharePoint, other authors are temporarily prevented from working in it until the file is checked in.
If required check-out is turned on for the document library in which the file is stored, the coauthoring features aren’t available.
For more info, see Check out or check in files in a document library.
To see who has a file checked out from SharePoint:
- Navigate in your web browser to the SharePoint document library.
- In the list of files, find the file you want to work on. If the following icon appears near the file name, someone else has the file checked out:

- Point at the file. A small pop-up window with info about the file appears. Included in the info will be the name of the person who has the file checked out. You can then contact that person to inquire when you may get access to the file.
For reference, please refer to:
Please let me know the results of the checks above. Thank you for your kindness and understanding.