Anyone know why I am getting a 403 using the below code to remove a track from a Spotify playlist?

Note: client_id, client_secret, username, and playlist_id declarations have been removed from the code below.

# Number of songs to delete from the playlist
num_songs_to_delete = 5  # Change this to the desired number

# Encode client_id and client_secret for authentication
client_creds = f"{client_id}:{client_secret}"
#client_creds_b64 = base64.b64encode(client_creds.encode()).decode()
client_creds_b64 = base64.b64encode('{}:{}'.format(client_id, client_secret).encode())


# Get access token using client credentials flow
token_url = "https://accounts.spotify.com/api/token"
token_data = {
    "grant_type": "client_credentials"
}
#token_headers = {
#    "Authorization": f"Basic {client_creds_b64}"
#}
token_headers = {"Authorization": "Basic {}".format(client_creds_b64.decode())}


token_response = requests.post(token_url, data=token_data, headers=token_headers)
token_response_data = token_response.json()
access_token = token_response_data['access_token']

# Get playlist tracks using the access token
playlist_url = f"https://api.spotify.com/v1/playlists/{playlist_id}/tracks"
playlist_headers = {
    "Authorization": f"Bearer {access_token}"
}
playlist_response = requests.get(playlist_url, headers=playlist_headers)
playlist_data = playlist_response.json()

# Sort tracks by their added_at timestamp in descending order
tracks = playlist_data['items']
sorted_tracks = sorted(tracks, key=lambda x: x['added_at'], reverse=True)


# Extract track URIs
tracks_uris = [track['track']['uri'] for track in sorted_tracks]

# Delete the specified number of tracks from the playlist
tracks_to_delete = tracks_uris[:min(num_songs_to_delete, len(tracks_uris))]

# Delete tracks
delete_url = f"https://api.spotify.com/v1/playlists/{playlist_id}/tracks"
delete_data = {
    "tracks": [{"uri": uri} for uri in tracks_to_delete]
}
delete_response = requests.delete(delete_url, headers=playlist_headers, data=json.dumps(delete_data))

print(delete_response)

if delete_response.status_code == 200:
    print(f"{num_songs_to_delete} songs deleted from the playlist.")
else:
    print("Failed to delete songs from the playlist.")

I've tried using both requests and spotipy libraries to connect to the Spotify Web API to create a program to remove songs from a specified playlist, however, I'm getting 403s when running the code. The client_id and client_secret match whats in the developer portal app. I've done research and can't determine the root cause. The app is created properly in the Spotify Developer Portal as well.

Any help is much appreciated!

The issue was with my app created within the Spotify Dashboard... I'm not sure why, but when I recreated the app and used the new client id/secret/redirect_uri, I was able to authenticate successfully and script ran fine.

Might have been due to me running other scripts trying to authenticate causing some cache issue in the browser?