Siri not working

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.

Change Siri settings on iPhone - Apple Support

montse1121 Said:

"Siri not working: My microphone works just fine but Siri doesn't seem to hear anything I say, why can that be?"

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Refer to the link provided atop this post.