Chrome steals the media keys from my favorite music player (MediaMonkey). To prevent it, you have to disable your “Hardware Media Key Handling” in: chrome://flags/#hardware-media-key-handling
Even so, flags/#hardware-media-key-handling. flags/#hardware-media-key-handling “flags/#hardware-media-key-handling” flags/#hardware-media-key-handling: flags/#hardware-media-key-handling [flags/#hardware-media-key-handling] [object Window].
flags/#hardware-media-key-handling ([object Window]) flags/#hardware-media-key-handling.