It seems it’s impossible to wake Siri up using the “Hey Siri” functionality while playing music (using either internal speakers and headphones.)
Is there a way to solve this issue?
IPhone – “Hey Siri” does not respond while playing music
iphonesiri
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Best Answer
As far as I'm aware Hey Siri isn't actually supported while music is playing.
People on Reddit have reported the same issue about a year ago - https://www.reddit.com/r/iphone/comments/7ssnz7/hey_siri_not_working_when_music_is_playing/