Permission & Access Issues

How to Fix Guest Invitations Not Allowed for Your Company in SharePoint

Steven Parker Oct 14, 2026 868 views

Question details

The user needs to resolve an error preventing them from sending guest invitations in SharePoint, even when external sharing appears to be enabled.

How to Fix "Guest Invitations Not Allowed for Your Company" in SharePoint

Product: Microsoft SharePoint
Device & OS: not provided
Scenario: Attempting to invite an external guest user to collaborate on a SharePoint site.
Observed behavior: An error message stating "Guest invitations not allowed for your company" is displayed, blocking the invitation process.

Before you start

Ensure you have Microsoft 365 Global Administrator or SharePoint Administrator privileges, as modifying Microsoft Entra ID and site-level domain policies requires elevated permissions.

Solution 1Recommended

Configure Microsoft Entra ID External Collaboration Settings

Update Microsoft Entra ID to allow external user domains so that guest invitations are no longer blocked at the tenant level.

SharePoint relies on Microsoft Entra ID (formerly Azure AD) for identity management. If Entra ID has strict collaboration restrictions in place, it will override your SharePoint settings and block external invitations.

Access the Microsoft Entra admin center

Navigate to External Identities

In the left-hand navigation menu, expand 'Identity', select 'External Identities', and then click on 'External collaboration settings'.

Locate Collaboration Restrictions

Scroll down to the 'Collaboration restrictions' section to view your current domain policies.

Add the Target Domain

Select the option to 'Allow invitations only to the specified domains' and add the external user's domain, or choose to allow invitations to any domain based on your company's security policy. Click 'Save'.

Configure Microsoft Entra ID External Collaboration Settings

Propagation Time: It may take a few hours for changes made in Microsoft Entra ID to fully sync and apply to your SharePoint environments.

Solution 2

Adjust SharePoint Site-Level External Sharing Settings

Ensure that the specific SharePoint site is configured to allow external sharing and that site-specific domain restrictions are not overriding the global settings.

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Frequently Asked Questions

Why does SharePoint say external sharing is enabled but still blocks guest invitations?

This happens when global Microsoft Entra ID (Azure AD) settings override site-level SharePoint settings. Even if the SharePoint site allows external sharing, Entra ID's collaboration domain restrictions can still block the invitation.

Do I need admin rights to fix the guest invitation error?

Yes. Modifying Microsoft Entra ID external identity settings and SharePoint admin center sharing policies requires you to have SharePoint Administrator or Global Administrator privileges.

How long does it take for external sharing settings to take effect in SharePoint?

After saving your changes in the Microsoft Entra admin center or SharePoint admin center, it can take anywhere from a few minutes up to 24 hours for the new domain policies to fully propagate across your tenant.

Can I restrict guest invitations to only specific partner companies?

Yes. In the Microsoft Entra ID External collaboration settings, you can choose the option 'Allow invitations only to the specified domains' to ensure your team can only invite guests from trusted partner companies.

Document & File Issues