Is anyone else having issues with co-authoring Word documents in SharePoint

Dear @Matthew Fitzmaurice,

Good day and thank you for your detailed post and for providing clear screenshots of the issues you're encountering with Word co-authoring in SharePoint. Let's address your points specifically. 

1. Styles, Bullets, and Numbering Dropping Off 

You are correct that the "Automatically update document styles" checkbox can serve as a workaround. However, as you've noted, it's not ideal because it can override legitimate formatting changes. 

• Root Cause: This issue typically occurs when there are style conflicts between the document's attached template (.dotx) and the local Normal.dotm templates of the various co-authors. During a co-authoring session, Word tries to reconcile these different style definitions, which can sometimes lead to formatting being dropped. 
• Recommended Solution: The most stable solution is to ensure all users are working from a single, centralized, and updated template. 
• Store the official document template (.dotx) in a trusted location within SharePoint that all users can access. 
• Train users to create new documents based on this official template. 
• This minimizes style conflicts and creates a more consistent co-authoring experience. 

2. Caption Numbering and Cross-References Breaking 

This is another common pain point. Field codes, such as SEQ fields for captions and REF fields for cross-references, require the entire document to be repaginated and recalculated to display correctly. The real-time nature of co-authoring can sometimes interfere with this process. 

• Root Cause: The co-authoring process sends and receives only the changed parts of the document to be efficient. This means the document is not always "fully re-calculated" on every user's machine in real-time, causing fields to appear broken or not update. Saving the document locally forces a complete recalculation, which is why that fixes the issue. 
• Recommended Actions: 
• Manual Field Update: Before finalizing or printing, instruct users to press Ctrl + A to select all content, and then press F9 to force an update of all field codes. This often resolves the display issue. 
• Use the Desktop App: While co-authoring works in Word for the web, the desktop version of Word has a more robust engine for handling complex documents with fields and templates. Encourage all authors to use the "Open in Desktop App" feature for the best experience. 
• Check for Updates: Ensure all users have the latest version of Microsoft 365 Apps installed. Microsoft frequently releases patches that improve the co-authoring experience. 

To provide further credibility and detailed guidance, here are some official Microsoft resources that address these topics. We highly recommend reviewing them. 

1. Troubleshoot co-authoring in Office: This is the primary document for diagnosing and resolving common co-authoring problems: Troubleshoot common coauthoring errors - Microsoft Support 
2. Document collaboration and co-authoring: This provides a general overview and best practices for setting up a successful collaborative environment: Document collaboration and co-authoring - Microsoft Support 

We hope this information helps you and your customers mitigate these issues. Please let us know if you have any further questions.

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