User (member or guest) shared a file, folder, or site in SharePoint or OneDrive for Business with a user in your organization's ...

User (member or guest) shared a file, folder, or site in SharePoint or OneDrive for Business with a user in your organization's directory. The value in the Detailcolumn for this activity identifies the name of the user the resource was shared with and whether this user is a member or a guest. This activity is often accompanied by a second event that describes how the user was granted access to the resource; for example, adding the user to a group that has access to the resource.