Invitations are blocked for this directory due to suspicious activity

Question

Invitations are blocked for this directory due to suspicious activity

David Henry 20

We are getting a "Invitations are blocked for this directory due to suspicious activity. Please contact Microsoft support for help" on one of our tenants. How do we clear the block?

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Rukmini 43,915 Reputation points Microsoft External Staff Moderator

2026-02-11T10:26:06.8766667+00:00
Hello David Henry,

As part of its security enhancements, Microsoft has anomaly detection systems in place to identify unusual activity, such as an unusually high number of invitations being sent from a tenant. If such anomalies are detected, the tenant may be temporarily blocked.

To unblock your tenant, please provide a business justification explaining the need for bulk invitations along with below details via private message only (do not post publicly):

Tenant ID

Correlation ID from the login failure

Timestamp of the failure

Business justification
Stefan @ Rosso samhälls- och fritidsförening 0 Reputation points

2026-09-17T10:50:14.1666667+00:00

Hi Rukmini,

I hope you don’t mind me reaching out here.

I found this thread where you previously helped another user with the same tenant-wide B2B invitation block and asked them to create a separate Entra ID question and tag you.

We are now experiencing the same issue. I have created a separate Q&A question, but unfortunately the @mention search does not return your profile, so I was unable to tag you there.

My question is:

https://learn.microsoft.com/en-us/answers/questions/6001075/microsoft-entra-b2b-guest-invitations-blocked-for

If you are able to help, or point me toward the right person or escalation path, I would be very grateful.

Thank you for your time.

Answer accepted by question author

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This comment has been deleted due to a violation of our Code of Conduct. The comment was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.
Rukmini 43,915 Reputation points Microsoft External Staff Moderator

2026-02-11T10:26:06.8766667+00:00

Hello David Henry,

As part of its security enhancements, Microsoft has anomaly detection systems in place to identify unusual activity, such as an unusually high number of invitations being sent from a tenant. If such anomalies are detected, the tenant may be temporarily blocked.

To unblock your tenant, please provide a business justification explaining the need for bulk invitations along with below details via private message only (do not post publicly):

Tenant ID

Correlation ID from the login failure

Timestamp of the failure

Business justification
Stefan @ Rosso samhälls- och fritidsförening 0 Reputation points

2026-09-17T10:50:14.1666667+00:00

Hi Rukmini,

I hope you don’t mind me reaching out here.

I found this thread where you previously helped another user with the same tenant-wide B2B invitation block and asked them to create a separate Entra ID question and tag you.

We are now experiencing the same issue. I have created a separate Q&A question, but unfortunately the @mention search does not return your profile, so I was unable to tag you there.

My question is:

https://learn.microsoft.com/en-us/answers/questions/6001075/microsoft-entra-b2b-guest-invitations-blocked-for

If you are able to help, or point me toward the right person or escalation path, I would be very grateful.

Thank you for your time.

Answer 1

Rukmini 43,915 Microsoft External Staff Moderator

Hello David Henry,

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.

If the resolution was helpful, kindly take a moment to click on and click on Yes for was this answer helpful. And, if you have any further query do let us know.

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