Assign Roles to Users in AD

Navigating back to Active Directory, you will need to assign the User attribute "altSecurityIdentities" with a value that matches the Role name in AWS.

For instance, if you want to assign a User a Role called 'admin' in AWS, you would assign the user's attribute 'altSecurityIdentities' with the value 'admin.
You can achieve this using the Active Directory Tool, such as "ADEdit".