Updated
The welcome message can include more than one way in. Xtream Codes and an M3U link are two doors to the same subscription. You do not need both open at once.
Xtream Codes
Xtream Codes is a username, a password and a server URL. Players such as TiviMate, IPTV Smarters, XCIPTV, iPlayTV and GSE have a form for those three fields. The channel list, the films and, usually, the programme guide are built from that login. This is the one to use on a Firestick, an Android TV box and an iPhone.
M3U
An M3U link is a single web address that points at the playlist. VLC uses it. Smart IPTV on a Samsung or LG TV uses it, uploaded against the TV’s MAC address. Official Kodi uses it in the PVR IPTV Simple Client, together with a separate XMLTV address for the guide.
If your app has no Xtream button, ask us for the M3U link rather than trying to assemble one. If you only received Xtream details and you are setting up Kodi or VLC, ask for the playlist URL. It is the same subscription.
What not to do
Do not enter the portal URL in the Xtream server field, or the Xtream URL in a MAG portal field. MAG and Formuler boxes have their own portal address. Mixing the two looks like a failed login.
Paste the value. Retyping a long URL on a television remote is how spaces and missing characters get in. The installation guides show the right fields for each device, with example text that you replace.