Global Admin cannot invite guest users – “Insufficient privileges”

ImmersiveEventNewbie 30 Reputation points
2026-05-07T19:24:23+00:00

I am a Global Administrator in our Microsoft Entra tenant.

All guest invitations are failing with the message: “User invitation failed. Insufficient privileges to complete the operation.”

This occurs for all users and all invite methods.

This started after legitimate guest onboarding for collaboration.

We believe this may be a tenant‑level B2B invitation restriction triggered in error.

Existing guests and Teams access continue to work correctly.

Can someone help review this and lift the restriction?

Microsoft Security | Microsoft Entra | Microsoft Entra External ID
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Answer accepted by question author
Sridevi Machavarapu 33,820 Reputation points Microsoft External Staff Moderator
2026-05-07T19:27:08.98+00:00

Hello ImmersiveEventNewbie,

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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