HRR Sifa do not work In the scenario (DB BR 425 ) I can’t not acknowledge the sifa release button when i play the scenarios with the DB BR 425
.... only if the music has stopped. ...... although if all sound has stopped, and you are using German loco DLC, then you are probably in a tunnel, and you won't hear SIFA......... or the music.....
Then you need to find someone with a PC and test it on PC to see if the problem happens on PC. If there is no problem on PC then it is highly unlikley that your issue will ever get fixed, because you are just an XBox player.