Contact Problems

Fix Microsoft 365 Maximum Number of Mail Users and Contacts Reached Error

Muhammad Talha Sep 25, 2026 868 views

Question details

The administrator is unable to add new contacts because the system indicates the maximum limit has been reached.

How to Resolve the Maximum Number of Mail Users and Contacts Reached Error in Microsoft 365

Product: Microsoft 365
Device & OS: not provided
Scenario: An administrator attempts to add new mail users or contacts using the Microsoft 365 admin center or via PowerShell.
Observed behavior: Microsoft 365 displays an error message stating that the maximum number of mail users and contacts has been reached, blocking the creation of new entries.

Before you start

Ensure you are logged in with an account that has Global Administrator privileges for the Microsoft 365 tenant, as standard users cannot access the necessary support portals.

Solution 1Recommended

Open a Service Request in the Microsoft 365 Admin Center

This issue is caused by backend tenant limitations and requires intervention from the Microsoft 365 support team to investigate and adjust the object limits.

Since this error relates to hard limits set on the backend of your Microsoft 365 subscription, there is no direct PowerShell command or toggle to bypass it on the user side. The backend support team must manually investigate the allocation.

If your Microsoft 365 subscription was purchased through a reseller or a syndicated partner (such as GoDaddy), Microsoft support may not be able to assist directly. In such cases, you must contact your specific provider's support team for assistance.

Access the Admin Center

Navigate to the Microsoft 365 admin center (admin.microsoft.com) and sign in using your Global Administrator credentials.

Navigate to Support

On the left-hand navigation menu, click on 'Show all' if necessary, then click on 'Support' followed by 'Help & support'.

Describe the Issue

In the search or issue description box, type 'Maximum number of mail users and contacts reached' and press Enter to review automated solutions.

Submit a New Service Request

If the automated solutions do not resolve the issue, click the option to contact support. Fill out the required details regarding the error and submit the service request so the backend team can investigate.

Open a Service Request in the Microsoft 365 Admin Center

Partner Subscriptions: If you do not see the option to contact Microsoft Support, your subscription is likely managed by a partner. Please reach out to your reseller's customer support portal directly.

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Frequently Asked Questions

What causes the maximum mail users and contacts error in Microsoft 365?

This error is triggered when your specific Microsoft 365 tenant reaches a backend object limit for mail-enabled users and contacts. It is a protective quota enforced by Exchange Online that blocks further additions via both the web portal and PowerShell.

Can I increase the contact limit myself using PowerShell?

No, this specific backend limitation cannot be overridden or increased by administrators using PowerShell commands. It requires a backend adjustment by the Microsoft 365 support team.

Why can't I find the support option in my Microsoft 365 admin center?

If the support option is missing or redirects you, your Microsoft 365 subscription was likely purchased through a third-party reseller or syndicated partner. You must contact that specific provider's support desk to raise a ticket.

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