SS IPTV

Hello, im having problems on one of my firetv sticks from AMAZON.
On 3 of them its working perfectly, but one of them, Simple IPTV works like a charm, but SSIPTV Wont load a channel.
Ive tried various m3u lists, but non of them are working, the media libary (my youtube videos, movies) Are working fine, but chanels dont.
I just get the messeg, "Wiedergabe nicht moglich" So that it cant play the channel. Any Ideas? Thank you.

The app must work the same way on the same devices.
Look for the differences in your playlists and how they are uploaded.

But, like i said, on the other stick, even on my pc its working. just on that one firestick (SS IPTV) It wont load any channels.
Ive never had this problem..

As I've already said, the app work the same way on the same devices. So if on another stick (the same) everything is ok, everysing must be ok on another stick. If not then there is a difference in stream you load. There is no another option.