Spotipy 401 / 405 No token provided

I have been working on a Spotify / Spotipy application which will add the current song to a certain playlist.
My functions for getting the current song and showing a playlist are all doing fine. My function for adding a song to a playlist is not.

I am getting the following error in my IDE:

http status: 405, code:-1 – https://api.spotify.com/v1/users/myUserID/playlists/myPlayListID/tracks:
error

When I copy paste the link to the browser, I am getting the following error:

{
  "error": {
    "status": 401,
    "message": "No token provided"
  }
}

As far as I’m aware I’m providing a token.

Here is my function which makes the Spotify object

def __createSpotifyObject(self):
    """Will create a Spotify object and return it"""

    # Defining the scope(s) of the application
    scope = "playlist-modify-public playlist-modify-private user-read-currently-playing"

    # Getting the token
    token = util.prompt_for_user_token(username=USER_NAME, scope=scope, client_id=CLIENT_ID, client_secret=CLIENT_SECRET, redirect_uri="https://localhost/")

    # Returning our Spotify object
    return spotipy.Spotify(auth=token)

Here is the function which tries to add a song to my playlist (this is where the error occurs)

I’ve tried catching the exception (which it did) and then trying to make a new Spotify object so it will refresh the token or something like that. It just gives me the same error.

def addCurrentSongToSelectedPlaylist(self):
    """Will add the currently playing song to the selected playlist"""

    # Checking if a playlist has been selected
    if (len(self.__selectedPlaylist ) < 1):

        print("No playlist selected")
        return

    # Getting the current song
    currentSong = self.getCurrentSong()

    # Adding the current song id to the selected playlist
    try:
        self.__spotify.user_playlist_add_tracks(USER, self.__selectedPlaylist, [currentSong["id"]])

    except spotipy.client.SpotifyException:
        # Re authenticating
        self.__spotify = self.__createSpotifyObject()
        self.__spotify.user_playlist_add_tracks(USER, self.__selectedPlaylist, [currentSong["id"]])

At this point the only thing I can think of is that the show playlist / show current playing song actions require fewer permissions, and that is why they work and the add song to playlist won’t.