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Unable to add or invite external users

Eric Regnier 5 Reputation points
2026-03-09T15:26:50.7933333+00:00

Guest user invitations are blocked at the tenant level. I am a Global Admin with a paid subscription. Invitations were working successfully up to 15 guests, then began failing with 'Insufficient privileges to complete the operation.' All collaboration settings are configured correctly. This appears to be a tenant-level block triggered by Microsoft's anomaly detection. Please unblock B2B invitations for this tenant

Microsoft Security | Microsoft Entra | Microsoft Entra External ID

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  1. Sridevi Machavarapu 26,995 Reputation points Microsoft External Staff Moderator
    2026-03-09T16:25:53.68+00:00

    Hello Eric Regnier,

    Thanks for sharing the requested details in Private messages tab.

    Based on the error message you received it appears that was Invitations are blocked in your tenant due to suspicious activity.

    We addressed this by collaborating with our internal team, who have now unblocked your tenant.

    You can check and confirm whether you were able to access the tenant which was blocked.

    Hope this helps. Let us know if you have any queries. Happy to assist you further.

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