item_selector failing to grab a inner level JSON array

I am having trouble importing ProPublica's representatives information into my drupal 8 site. The JSON request I am hitting is a nested array, I am looking to grab the second level array items to import into my site. But when I try to just call that item_selector ID (members) I keep on getting a error message:

[error] Could not retrieve source count from member: Passed variable is not an array or object

I know the issue falls on the item_selector field in my migrate_plus.migration.member.yml file,

But i've tried everything and it still returns that same error message:
members
/members
members/
/results/members
/results/members/
results/members
results.0.members

nothing appears to work.

I have tested my migration yml file with doing a simple request on data that falls under results array and that does work. I attached below a sample size of the JSON data I'm trying to request as well as my migrate_plus.migration.member.yml file minus my x-api-key.
Any help or guidance would be greatly appreciated.

{
  "status": "OK",
  "copyright": " Copyright (c) 2019 Pro Publica Inc. All Rights Reserved.",
  "results": [
    {
      "congress": "116",
      "chamber": "House",
      "num_results": 442,
      "offset": 0,
      "members": [
        {
          "id": "A000374",
          "title": "Representative",
          "short_title": "Rep.",
          "api_uri": "https://api.propublica.org/congress/v1/members/A000374.json",
          "first_name": "Ralph",
          "middle_name": null,
          "last_name": "Abraham",
          "suffix": null,
          "date_of_birth": "1954-09-16",
          "gender": "M",
          "party": "R",
          "leadership_role": null,
          "twitter_account": "RepAbraham",
          "facebook_account": "CongressmanRalphAbraham",
          "youtube_account": null,
          "govtrack_id": "412630",
          "cspan_id": "76236",
          "votesmart_id": "155414",
          "icpsr_id": "21522",
          "crp_id": "N00036633",
          "google_entity_id": "/m/012dwd7_",
          "fec_candidate_id": "H4LA05221",
          "url": "https://abraham.house.gov",
          "rss_url": "https://abraham.house.gov/rss.xml",
          "contact_form": null,
          "in_office": true,
          "dw_nominate": 0.524,
          "ideal_point": null,
          "seniority": "6",
          "next_election": "2020",
          "total_votes": 482,
          "missed_votes": 197,
          "total_present": 0,
          "last_updated": "2019-07-17 15:00:22 -0400",
          "ocd_id": "ocd-division/country:us/state:la/cd:5",
          "office": "417 Cannon House Office Building",
          "phone": "202-225-8490",
          "fax": null,
          "state": "LA",
          "district": "5",
          "at_large": false,
          "geoid": "2205",
          "missed_votes_pct": 40.87,
          "votes_with_party_pct": 94.37
        },
        {
          "id": "A000370",
          "title": "Representative",
          "short_title": "Rep.",
          "api_uri": "https://api.propublica.org/congress/v1/members/A000370.json",
          "first_name": "Alma",
          "middle_name": null,
          "last_name": "Adams",
          "suffix": null,
          "date_of_birth": "1946-05-27",
          "gender": "F",
          "party": "D",
          "leadership_role": null,
          "twitter_account": "RepAdams",
          "facebook_account": "CongresswomanAdams",
          "youtube_account": null,
          "govtrack_id": "412607",
          "cspan_id": "76386",
          "votesmart_id": "5935",
          "icpsr_id": "21545",
          "crp_id": "N00035451",
          "google_entity_id": "/m/02b45d",
          "fec_candidate_id": "H4NC12100",
          "url": "https://adams.house.gov",
          "rss_url": "https://adams.house.gov/rss.xml",
          "contact_form": null,
          "in_office": true,
          "dw_nominate": -0.468,
          "ideal_point": null,
          "seniority": "8",
          "next_election": "2020",
          "total_votes": 482,
          "missed_votes": 13,
          "total_present": 0,
          "last_updated": "2019-07-17 15:00:24 -0400",
          "ocd_id": "ocd-division/country:us/state:nc/cd:12",
          "office": "2436 Rayburn House Office Building",
          "phone": "202-225-1510",
          "fax": null,
          "state": "NC",
          "district": "12",
          "at_large": false,
          "geoid": "3712",
          "missed_votes_pct": 2.7,
          "votes_with_party_pct": 98.93
        }
      ]
    }
  ]
}