Hi,
you have to use Referer paramter of the request.
Code:
streamlink --http-header "Referer=https://sekastream.com" hlsvariant://https://sdcdn.tk/edge/ntv-spor/playlist.m3u8 best
Just check this in browser webconsole if you pick the master playlist so there you can see the infos.
Code:
Host: sdcdn.tk
User-Agent: Mozilla/5.0
Accept: */*
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br
Referer: https://sekastream.com/canli-tv-bot/index.php?id=0
Origin: https://sekastream.com
Connection: keep-alive
greetz