"Invitations are blocked for this directory due to suspicious activity" for a free tier tenant

Question

Hello, we have a tenant to authorize guest users to access an app after they successfully authenticate via MFA.

We've been using it for several years and have now got just over 5000 of guest users. I tried adding around 200 users in bulk last week but the operation failed mid-way with the "Request was unsuccessful. Details: Invitations are blocked for this directory due to suspicious activity. Please contact Microsoft support for help." error message.

Now neither I nor other admins can invite guest users anymore with "Insufficient privileges to complete the operation" errors popping up when attempting to do so.

Answer 1

Hi @Andrius Dvinelis

Thank you for posting this in Microsoft Q&A.

We appreciate you contacting us offline.

The issue you encountered was caused by attempting to invite bulk guest users. We addressed this by collaborating with our internal Product Group team, who have now unblocked your tenant. As you've mentioned, you can now access it successfully.

Hope this helps. Do let us know if you any further queries.

Thanks,

Navya.

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Answer 2

Hi Navya,

I have the same issue here. Could you help me unblock my tenant as well ?

Answer 3

Invitations are blocked for this directory due to suspicious activity. Please contact Microsoft support for help.

Cannot add guest users to my teams.

Answer 4

I have the same issue here. Could you contact me to unblock my tenant as well ?

Answer 5

I have the same issue here. Could you contact me offline to unblock my tenant as well ?