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A workspace admin can invite someone from another company with their name, work email, and workspace role. The recipient does not need to provide Microsoft directory or object IDs.
1

Open the destination workspace

Switch to the workspace the person should access, then open its Users page.
2

Send the invitation

Enter their name and work email, select their role, and send the invitation. Only a workspace owner can invite another owner.
3

Accept with Microsoft sign-in

The recipient opens the emailed link, signs in with the invited Microsoft work or school account, and selects Accept invitation. Personal Microsoft accounts are not supported.
Invitation links expire after seven days and work once. Use Resend invitation on a pending invitation if needed; the previous link stops working. Cancelling a pending invitation prevents acceptance. People with one workspace membership open it directly. People with several active memberships can use Switch workspace…. Their role can differ between workspaces. Revoke access in the destination workspace’s Users page. Removing a guest from Microsoft Entra alone does not remove an explicit Neo membership. An invitation grants access to one workspace. It does not place either company under the other’s organization.