Invitations are blocked for this directory due to suspicious activity

Question

We are trying to sync out users to our other tenant but has an error message, Invitations are blocked for this directory due to suspicious activity. Please contact Microsoft support for help. I've opened tickets since last month but to no response.
Could anyone has answer to this issue?

Thank you!

Answer 1

Hello @Mark Angelo Cuaycong

Thanks for contacting MS Q&A. I will be able to help you with resolving your issues.

The error you're seeing, "Invitations are blocked for this directory due to suspicious activity. Don't hesitate to get in touch with Microsoft support for help," indicates that Microsoft has temporarily blocked your tenant from sending guest invitations due to what it perceives as unusual or potentially abusive activity (e.g., mass invites in a short period). Can you confirm if you are trying to invite users above 50 /hr?

For now, only MS support can assist you, and once you are unblocked, kindly do the following

• Throttle your invitation rate: Instead of sending 200+ invites in one go, batch them (e.g., 20-50 per hour).

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Siri

Answer 2

Hi Mark Angelo Cuaycong

This issue occurred because the tenant was less than or equal to 30 days old and had performed more than 500 email invitations.

As you are performing bulk synchronization from one tenant to another tenant you encountered this limitation.

To resolve this issue, we engaged with the support team. They will unblock user invitations for this directory. After that you should now be able to invite users in bulk without any issues.

Once the issue has been resolved by our support team, please feel free to revisit and kindly click "Accept Answer," as this will be helpful to other community members facing similar issues.