SS IPTV

Guys, please help me understand, i'm going crazy. I have SS Iptv installed on a Tv lg on webos 6.0 but I have a problem on the visualization of streaming links of free italian tv.
https://mediapolis.rai.it/relinker/reli ... ont=308718
this link is displayed.
https://mediapolis.rai.it/relinker/reli ... ont=746992
this no. Because? I do not understand. They are m3u8 files and look identical. can you make me understand? Note that the TV's built-in browser works. Do I have to write something to the m3u playlist file to make it read? Please help me

for all those encountering the same problem, I solved it with:
mime-type="application/vnd.apple.mpegurl"