If you are using an STB Emu code (MAC address), the process is slightly different.
There are two common ways IPTV services deliver content to users:
Some providers offer both: an Xtream-style login for full portal-like features and an M3U link for simpler players. STB Emu typically uses portal credentials; other players accept M3U.
Apps like TiviMate (for Android TV/Firestick) and IPTV Smarters (available on almost all platforms) are the industry standards for M3U and Xtream Codes.