REST Api call for fetching the users from Distribution List

Hi,

I have added a specific Distribution List (e.g. ContosoAdmins) of AD as Site Collection Admin.

This ContosoAdmins consist of below listed user,

1. AdminUser1

2. AdminUser2

3. AdminUser3

While I am try to fetch these users by using below REST api call,

http://<SiteCollection>/_api/web/siteusers?$filter=IsSiteAdmin%20eq%20true

It only fetches ContosoAdmins details as response whereas expected result should fetch details of all 3 users i.e. AdminUser1, AdminUser2, AdminUser3.

Kindly help, if we have alternate rest api to fetch this expected result.

Hope this help.

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Regards,

Amjad Khan