"Hey Siri" responds only on shouting too loud.
My newly purchased iPhone 14 doesn’t respond to "hey siri" despite following all procedures and troubleshooting.
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Retrain Siri with your voice
Go to Settings > Siri & Search, turn off Listen for “Hey Siri,” then turn on Listen for “Hey Siri” again. To change Siri accessibility settings, see Use accessibility features with Siri on iPhone.