In SharePoint we have "Everyone except external users" AD Group but can't be synced by SCIM

We are using SharePoint online and SharePoint server 2016, 2019, subscription edition and we are seeing some issues and Azure AD.

I have synced a customer's Azure AD using SCIM .

Also synced SharePoint site in a SharePointCustomApp that we have using SharePoint APIs.

Now for SharePoint we get pages with ACL for groups and one of the group's name is "Everyone except external users". All the pages have groups associated and they are federated from Azure AD and we found all groups. However "Everyone except external users" group cannot be synced via IDC SCIM protocol. 

Other groups we are able to sync properly(can get its members).

Our other customers are also facing same issue for this "Everyone except external users" group.

We need this group ("Everyone except external users") also to return proper members.