Hi,

first of all to be sure installed Streamlink 2.0.0 via Python3 again.

After that tested all streams one by one with the turkuvaz.py

Most of them are working, only 2 of 9 channels missing, "error: No plugin can handle URL"

A2 and A Haber TV:

https://www.atv.com.tr/a2tv/canli-yayin
https://www.ahaber.com.tr/video/canli-yayin