Why the fire alarms never went off in Hong Kong fire?

How come fire alarm never went off in Hong Kong fire? 

https://www.threads.com/@striking_biking/post/DRgr4zOgdp7/media

https://www.nytimes.com/2025/11/27/world/asia/hong-kong-fire-survivors-escape.html

https://www.cbc.ca/player/play/video/9.6994085