curl --request GET \
  --url https://saas.pads365.com/rdx/NDS.Services.Authentication/api/v1/ExternalUserGroup

{
  "Succeeded": true,
  "Message": "<string>",
  "Code": "<string>",
  "ExternalUserGroups": [
    {
      "Id": "<string>",
      "ExternalAuthenticationProviderId": "<string>",
      "ExternalId": "<string>",
      "Name": "<string>"
    }
  ]
}