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

Question

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

テナント管理者アカウント 0

I usd Microsoft Entra ID.(I have Microsoft Entra ID Free Licence.)

When I tried to invite a group of external users, I received this error: “Invitations to this directory have been blocked due to suspicious activity. Please contact Microsoft Support if you need assistance.”

I use this system because I need a way for external partners to log in, but I didn’t want to add these people to our internal Entra ID, so I set up this new Entra ID.

Can the Microsoft support team help me with this?

I'm having trouble because the feature isn't working, so I'd appreciate your help.

Thanmayi Godithi 11,825 Reputation points Microsoft External Staff Moderator

2026-05-12T09:05:02.0733333+00:00

Hi テナント管理者アカウント ,

Thank you for reaching out to Microsoft Q&A.

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 requested details via private message only (do not post publicly).
テナント管理者アカウント 0 Reputation points

2026-05-21T08:34:58.3866667+00:00

@Thanmayi Godithi
Thank you for your assistance.

~~I can no longer see my private messages. Has this issue been resolved?~~

Sorry, I missed the “Private” button.　I can access private message.

I apologize for the inconvenience, but I would appreciate it if you could reply.

1 answer

Your answer

Thanmayi Godithi 11,825 Reputation points Microsoft External Staff Moderator

2026-05-12T09:05:02.0733333+00:00

Hi テナント管理者アカウント ,

Thank you for reaching out to Microsoft Q&A.

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 requested details via private message only (do not post publicly).
テナント管理者アカウント 0 Reputation points

2026-05-21T08:34:58.3866667+00:00

@Thanmayi Godithi
Thank you for your assistance.

~~I can no longer see my private messages. Has this issue been resolved?~~

Sorry, I missed the “Private” button.　I can access private message.

I apologize for the inconvenience, but I would appreciate it if you could reply.

Answer 1

Yes. When invitations are blocked due to suspicious activity, only Microsoft support can review and potentially unblock the tenant.

Because this is an issue with the directory itself (not just a configuration setting), the required action is to contact Microsoft support and open a support case so they can investigate and restore invitation capability if appropriate.

For contacting support and getting to a human agent, use the Microsoft Support contact options appropriate for the account type and product. If access to the Azure or Entra portals is available, a support request can also be created from there once signed in.

If the tenant ever becomes inaccessible due to inactivity or other blocking conditions, tenant administrators are expected to contact Microsoft using the published global support phone numbers or support channels to request reactivation or remediation.

References: