How do I get to an AzureAD group members from a SharePoint LoginName using the graph

I am trying to use the graph to find all users in a SharePoint group on O365. The Sharepoint Group contains  Azure AD groups. The LoginName for one of these Azure AD groups within a sharepoint group looks like this:”c:0-.f|rolemanager|s-1-5-21-1663639147-559416195-7125487034-53164323” . How do I take that LoginName, that represents and Azure AD  group and find its members using the graph?

 

I found this link https://social.technet.microsoft.com/wiki/contents/articles/13921.sharepoint-20102013-claims-encoding.aspx?PageIndex=2 which explains how the Login names are formed (the above is a claim for a role with a string value with an AuthMode of forms based Autentication), but that does not help.  The LoginName seems to represent a SID. How do I find that Sid in Azure AD using the graph?   I Can find the group using its displayName using “v1.0/groups?$filter=displayName eq 'The Name of the group'&$expand=members” but that does not help because I have Unified groups and AD groups with the same displayName.  When I run that query to get the group by displayName  the result does not have a SID. It does have an onPremisesSecurityIdentifier field, but the value in that field does not equal the sid that is shown in the LoginName value in the sharepoint group.

 

How do I get to an AzureAD group members from a SharePoint LoginName using the graph?