This report shows you a list of all External Users that have access to your SharePoint Online environment.
An external user is someone outside of your organization who can access your SharePoint Online sites and documents and is usually not employees, contractors, or onsite agents for you or your affiliates.
This report is especially useful to determine who outside of your organisation has access to your SharePoint data.
Filtering the Data
You can use the Site Collection Filter to view the external users who have access to a specific Site Collection.
Alternatively, you can search for a specific user by typing their name or UPN into the search box above the data table.
Once you have the report configured to your liking you can Export, Schedule or Email this report just like any other.