Permission & Access Issues

How to Make an Outlook Group Visible to Members in Another Domain

Amos Gikunda Sep 28, 2026 868 views

Question details

A user needs to configure an Outlook or Microsoft 365 group so that members from a different domain can view and access it.

How to Make an Outlook Group Visible to Members in Another Domain

Product: Microsoft Outlook / Microsoft 365
Device & OS: not provided
Scenario: Collaborating and sharing group resources with users located outside the primary organization's domain.
Observed behavior: The group does not appear for users in the other domain because cross-domain access, external sharing restrictions, or tenant policies are blocking visibility.

Before you start

Ensure you have the exact email addresses of the external users you wish to invite. You may also need to contact your Microsoft 365 IT administrator, as enabling cross-domain visibility often requires administrative privileges to adjust external sharing and guest access policies.

Solution 1Recommended

Review Group Settings and Add Members via Outlook on the Web

As a group owner, you can use the Outlook web interface to check your group's membership settings and manually add users from another domain if organizational policies permit it.

This method is the quickest way for group owners to invite external members. However, if your organization has disabled external guest access globally, you will not be able to successfully add users from outside your domain until an administrator updates the tenant policies.

Open Outlook on the Web

Navigate to the Specific Group

Scroll down the left-hand navigation pane, expand the 'Groups' section, and click on the specific group you want to make visible to external members.

Access Group Settings

Click on the group name or the gear icon at the top of the group page to open the group settings. Select 'Members' to view the current membership list.

Add External Members

Click on 'Add members' and type in the full email addresses of the users in the other domain. If permitted by your organization, their external accounts will be added as guests, and the group will become visible to them.

Review Group Settings and Add Members via Outlook on the Web

Domain Trust is Not Enough: Simply having domain trust between two organizations does not automatically make groups visible. You must explicitly add the external users as guests or members to the group.

Solution 2

Enable External Guest Access in Microsoft 365 Admin Center

If group owners cannot add external members, an IT administrator must configure the tenant-level external sharing and cross-domain access policies.

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Frequently Asked Questions

Why do I get an error when trying to add a user from another domain to my Outlook group?

This usually happens because your organization's Microsoft 365 administrator has disabled external guest access. You will need to request that they adjust the tenant's external sharing policies to allow guests.

Does setting up domain trust automatically make all groups visible across domains?

No, domain trust alone does not grant automatic visibility to Microsoft 365 groups. Group owners still need to manually invite external users as guests, and the appropriate cross-tenant access settings must be enabled.

How can I verify if external users can actually see the Outlook group?

The most reliable way to verify visibility is to invite a test email account from the external domain, then log in with that test account on Outlook on the web to ensure the group appears in the navigation pane and the content is accessible.

Document & File Issues