If the m3u8  link does not work, make sure of the following:
1- The m3u8 link is not banned in your site 

click right in video zone > select inspect element > go to console tab 

if you found this error : https://prnt.sc/fPJwThR-piz4

Access to XMLHttpRequest at 'https://zmm9.s3.----------------.com/Tj.m3u8' from origin 'https://blog.--------.es' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

It means that the link is blocked on your site, so you need to contact the owner of m3u8.

2- The m3u8 link is valid for use on websites, some of the links are only visible to one user, so do not use them on your site.
Contact your service provider.