The player in the first position of the group list at challonge is required to create a lobby and send the lobby password into the corresponding Discord channel. If a player is not able to do so, the next player on the list must do it.
Select TFT in the game client and click the PLAY.
Select 1vs7 TEAMFIGHT TACTICS, NORMAL. Press CONFIRM.
CLOSE your group.
Click on the INVITE PLAYER.
Enter the nicknames of the players in your group and click SEND INVITES.