adding song to playlist won't work with one specific user (update: 2 users)

[noelnic]

Describe the bug
Hey all! I am trying to build an app, that can add songs to playlists the user owns.
The bizarre is, I tested the code for me and another person and it works as it should.
For another specific user, lets call him bob, it does not work.
I can delete songs from bobs playlist, but I can't add any songs. I run the exactly same code.
Happens with:

Your code

current_playback = sp.current_playback()
data = load_skipped_tracks()
trash_playlist_id = data["trash_playlist_ID"] #json file where I stored a playlist_id
currently_played_song_id = current_song["item"]["id"]

print("trying to add song")
add_song_to_trashplaylist(trash_playlist_id, currently_played_song_id) 
print("successful")

#def add_song_to_trashplaylist(trash_playlist_id, track_id):
    list_of_tracks = [track_id] # also tried this: list_of_tracks = {'uris': [track_id]}
    try:
        sp.playlist_add_items(trash_playlist_id, list_of_tracks)
    except Exception as e:
        print(e)
        print("normal adding did not work, trying replacing instead")
        sp.playlist_replace_items(trash_playlist_id, list_of_tracks) # did work!

Expected behavior
I expect that the song is added to the playlist. I found out I can replace the song to the playlist. I am confused with the "Insufficient client scope" exception, because I got both modify scopes and it works with other users.

Output

trying to add song #print
HTTP Error for POST to https://api.spotify.com/v1/playlists/6i4s8LeNdHgtozUviUDkfz/tracks with Params: {'position': None} returned 403 due to Insufficient client scope
http status: 403, code:-1 - https://api.spotify.com/v1/playlists/6i4s8LeNdHgtozUviUDkfz/tracks:
 Insufficient client scope, reason: None
normal adding did not work, trying replacing instead # print
successful # print

Environment:

• OS: [Windows 10]
• Python version [Python 3.10.4]
• spotipy version [2.23.0]
• using VSCode

I am relatively new to the space, so I hope I provided everything correctly in the right manner.
Thanks for your time!

[dieser-niko]

Hi, sorry for the late reply. Just to be sure, what are your current scopes?

And btw, please make use of formatting code blocks