Certain external users who previously had access to SharePoint sites and documents have lost their access. Attempts to re-add these users to SharePoint security groups have been unsuccessful.
How can I solve this?
To address this issue, it is essential to ensure that the prerequisites for external sharing in SharePoint Online are met. External sharing settings must be configured both at the organization level and the site level.
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Organization's levels for the external sharing: External sharing must first be enabled at the organization level. This setting can be managed through the SharePoint admin center. Administrators can follow the detailed steps provided in the to turn external sharing on or off.
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Site level for and organization's sharing: Once external sharing is enabled at the organization level, it can be further restricted or customized on a site-by-site basis. Only global or SharePoint administrators in Office 365 have the authority to modify these settings.
Additional considerations
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Guest Accounts: When external sharing is enabled, guest accounts may be created for external users. These accounts are subject to Microsoft Entra B2B collaboration settings, which include guest invite policies and collaboration restrictions.
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Permissions Management: Administrators should ensure that permissions are appropriately configured for the affected sites and documents. This includes verifying that the external users are correctly added to the relevant security groups or granted direct access.
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Troubleshooting Access Issues: If external users still cannot access the content, administrators may need to re-share the content with them or verify that their guest accounts are active and properly linked to their email addresses.
By following these steps and ensuring that external sharing settings are correctly configured, administrators can restore access for external users and maintain secure collaboration in SharePoint Online.
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