In connection with your onboarding with us, you need to download a CSV file with all the users that you have in your Azure AD.
1. Log on to https://portal.azure.com with an account that has organization-level admin privileges.
2. In the left-hand menu, click Azure Active Directory.
3. Then click Users in the section Manage.
4. Then click Bulk operations and select Download users.
5. Name the file and click Start.
6. The CSV file is now generated. This may take a while. Once the file is ready for download you can find it by clicking File is ready! Click here to download.
You can also find it - and all previously created files - by clicking Bulk operation results (Preview).