Resharing to external users required after enabling Microsoft SharePoint integration with Microsoft Entra B2B [MC1089315]

Updated June 13, 2025: We have updated the timeline below. Thank you for your patience.

As part of our ongoing efforts to enhance security, we are making a critical change to how Microsoft SharePoint and Microsoft OneDrive integrate with Microsoft Entra B2B. This change affects how external users access previously shared content. 

[When this will happen:]

Effective July 1, 2025, external users will no longer be able to access files, folders, or sites via links that were shared before your organization enabled Microsoft SharePoint and OneDrive integration with Microsoft Entra B2B. 

[How this will affect your organization:]

All users in every tenant that has already enabled or in future, will enable SharePoint integration with Entra B2B are impacted. Your external users will lose access to all the files, folders and sites shared before enabling this integration. To give access again, resharing is required. After the integration is enabled, external sharing will use Microsoft Entra B2B Invitation Manager

External users attempting to use older links will encounter an error message “Sorry, something went wrong. This organization has updated its guest access settings. To access this item, please contact the person who shared it with you and ask them to reshare it with you.

Impact to end users:

•  External users will lose access to content shared before your tenant enabled SharePoint integration with Entra B2B.
• To restore access, users must reshare the file, folder, or site with the intended external collaborators.
•  If the original sender is unavailable or lacks permission, another authorized user must reshare the content.
•  No changes are required to the sharing process—users can continue to share content as they always have.

[What you need to do to prepare:]

1.  Notify your users: Inform your users who collaborate externally that previously shared links will no longer work.
2. Update internal documentation: Adjust training materials and helpdesk scripts to reflect this change.

Learn more: Microsoft Entra B2B integration for SharePoint & OneDrive – SharePoint in Microsoft 365 | Microsoft Learn

Source: Microsoft

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