@Ana-Talavera, you could try making a batch file, and putting a 5 second pause between the two commands. The command that the TRIGGERcmd agent would run could be: c:\scripts\fortnite.bat
And you'd create c:\scripts\fortnite.bat file with these contents:
"C:\Program Files (x86)\Epic Games\Launcher\Portal\Binaries\Win32\EpicGamesLauncher.exe" timeout 5 "C:\Program Files (x86)\Epic Games\Fortnite\FortniteGame\Binaries\Win64\FortniteLauncher.exe"