Publicly shared .txt files containing MAC addresses are often used by thousands of people simultaneously, causing the server to block the connection or lag heavily.
If you are struggling with MAC portals, consider using apps like IPTV Smarters Pro or TiviMate , which are more flexible with standard M3U links. Important Security Note Publicly shared
If you are looking for active portals, it is better to search for updates. You can find active lists on community forums and dedicated tech sites: Publicly shared