How do I share a site with all users in an external org?

Question

We have a subsidiary company with users on another tenant. How can we share our site with all users in that tenant?

Answer 1

Hi @Lachlan Wintour

There are a couple things you need to do if you don't want to share a link with Anyone:

1. You need to invite users from externaldomain.com as guests users to your tenant.
2. You then can build an Azure AD Dynamic membership group and share access with that group.

1) How to build an Azure AD Dynamic membership group that uses a contains operator for their e-mail domain.

Example:

(user.mail -contains 'externaldomain.com')

2) Once you have a dynamic membership group, you can share access with that group to grant them access.

Dynamic membership rules for groups in Azure Active Directory

https://learn.microsoft.com/en-us/azure/active-directory/enterprise-users/groups-dynamic-membership

Use Dynamic Groups to access SharePoint Online sites

https://blog.atwork.at/post/Dynamic-groups-accessing-SharePoint-Online

---

If you want to share a link with Anyone*:**

https://learn.microsoft.com/en-us/sharepoint/external-sharing-overview#how-the-external-sharing-settings-work

---

If this is helpful please accept answer.

Answer 2

@Lachlan Wintour

Based on your description, I understand that you want to share SharePoint sites with external users.

Here are steps:

1.Enable external sharing in the tenant level. Go to SharePoint admin center -> Polices -> Sharing -> Set Anyone.

2.Enable external sharing in the site level. Go to SharePoint admin center -> Sites -> Active sites -> Select the site you want to share -> Sharing -> Set Anyone.

3.Share SharePoint sites with external users. Go to Site settings -> Site permissions -> Share site only.

---

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.