How get value in the object in the array, if array is in the object and the object in the next array?

Expected effect: iterate objects in array, get value example 'email' in objects in array comments. I would like to spell the array and nested objects and arrays and return the 'email' value. When I get array comments I try to get value email in object I have error email is undefined

let scores =  [
  {
    "userId": 1,
    "id": 1,
    "title": "bbbb",
    "project": "JS",
    "completed": false,
    "comments": [
      {
        "itemId": 1,
        "id": 1,
        "name": "provident id voluptas",
        "email": "[email protected]",
        "body": "sdsdsd"
      },
      {
        "itemId": 1,
        "id": 2,
        "name": "provident id voluptas",
        "email": "[email protected]",
        "body": "sdsdsd"
      }
    ]
  },
 {
    "userId": 1,
    "id": 2,
    "title": "ggggg",
    "comments": [
      {
        "itemId": 2,
        "id": 1,
        "name": "odio adipisci rerum aut animi",
        "email": "[email protected]",
        "body": "dsdsdsd"
      }
    ]
  }
]


let obj;

for (var key in scores) {
      obj = scores[key];
      console.log(obj.comments); //return objects array
    }

 for (var key in ob) {
      let ob1 = ob[key];
      console.log(ob1[email]); //return email is undefined
    }