I cannot remove a subdocment in mongo Db?

Question

I am trying to delete a subdocument from my users collection in Mongo Db, my best attempt to remove the subdocument is the the route below. However is does not work. I have been able to $unset the entire Favorite Movies array but I only want to delete one Item by its _id within the Favorite Movies Sub-Document. What am I doing Wrong.

// My Route That is supposed to Delete a Subdocument:

app.put('/Favorites/:UserName/delete/:_id',passport.authenticate('jwt', { session: false }), (req, res) => {
    users.findOneAndUpdate({ UserName: req.params.UserName })
      .then((user) => {
          
        if (!user) {
          res.status(400).send('ID: ' + req.params._id + ' was not found!!');
        } else {
          user.updateOne(
            {UserName: req.params.UserName},
            {
              $pull: {
                "FavoriteMovies": {
                
                  "ObjectId": req.params._id
                }
              }
            
            })
          
          res.status(200).send('ID: ' + req.params._id + ' was deleted!');
          
        }
      })
      .catch((err) => {
        console.error(err);
        res.status(500).send('Error: ' + err);
      });
  });

//Mongoose Model Schema for User in which the Subdocuemnt I want to delete is in Favorite Movies:

  let usersSchema = mongoose.Schema({
    _id: {type: Object},
    UserName: {type: String, required: true},
    Password: {type: String, required: true},
    Email: {type: String, required: true},
    Birthday: Date,
    FavoriteMovies:{type: Object},
    ImagePath: String
  });

The User Object with Favorite Movies Subdocument in Postman- Raw:

[
    {
        "_id": 1650119097711,
        "UserName": "robbies",
        "Password": "$2b$10$UZmRBLZF0UGWrB1OrZVI2ePc7N1ae5sSZj0RlSU8WyRIRsfdE.yYW",
        "Email": "[email protected]",
        "Birthday": "1988-05-05T00:00:00.000Z",
        "FavoriteMovies": [
            {
                "ObjectId": 2009,
                "Title": "The NoteBook",
                "Genre": "Romance"
            },
            {
                "ObjectId": 2001,
                "Title": "Hacksaw Ridge",
                "Genre": "Action"
            }
        ],
        "ImagePath": null,
        "__v": 0
    }
]