Siri does not respond to my voice command

I would first recommend re-setting up your "Hey Siri" commands

1. launch the settings app on your iPhone
2. Click on Siri and Search within the settings home page
3. Check to see if Listen for Hey Siri is enabled
4. IF Listen for Hey Siri is enabled, disable it. Otherwise, skip and proceed to step 5
5. disable Listen for Hey Siri
6. when prompted, confirm Enable Siri
7. follow the voice prompts to set up hey siri

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The following is adapted from If Siri or "Hey Siri" isn't working by Apple Support

Note: "hey siri" will not work when...

• Your device is face down
• When the cover is closed on your iPhone or iPad case
• When Low Power Mode is enabled on your iPhone
• If you have an iPhone 6 or earlier, most iPads, or an iPod touch and aren't connected to power.

If “Hey Siri” is responding with multiple devices, learn what to do.

With that in mind...

1. Check your internet connectivity
2. Make sure Siri is on

• • On your iPhone, iPad or iPod touch, go to Settings > Siri & Search and make sure that Listen for "Hey Siri", and Press Home for Siri or Press Side Button for Siri are turned on.
  • On AirPods (2nd generation), Make sure that you turn on "Hey Siri" on the iOS device that your AirPods are connected to.
  • On macOS Sierra or later, go to Apple () menu > System Preferences, click Siri, then make sure that Enable Ask Siri is selected.
  • If you don't see an option for Siri, check that Siri is available in your country or region. Learn which Siri features are supported in which countries and regions on iOS and Mac.

3. Make sure there are no restrictions on for Siri

• • If you can't turn on Siri on your iOS device or Mac, make sure that you haven't disabled Siri in Restrictions.
  • On iOS 12 or later, go to Settings > Screen Time > Content & Privacy Restrictions > Allowed Apps and make sure that Siri & Dictation isn't turned off. On iOS 11 or earlier, go to Settings > General > Restrictions.
  • On macOS Sierra or later, go to Apple () menu > System Preferences > Parental Controls > Other and make sure that Turn off Siri & Dictation isn't selected.

4. Check your microphone

• • If Siri doesn't hear you correctly or doesn’t respond when you ask a question, make sure your microphones are working:
  • On your iPhone, iPad or iPod touch, remove screen protectors, films or cases that cover the microphones, then ask Siri a question. If Siri doesn't respond, connect a headset with a microphone, like EarPods or AirPods, then ask Siri a question and see if Siri responds.
  • On your Mac, go to Apple () menu > System Preferences > Sound > Input and select a mic and check the input levels.
  • For AirPods, use your connected iOS device. On your iOS device, go to Settings > Bluetooth, tap  next to your AirPods, then tap Microphone and make sure that Automatically Switch AirPods is selected. Also check that there isn't any dirt covering the microphone on your AirPods. If there is, learn how to clean your AirPods.

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[Edited by Moderator]

Know it here --> If Siri or "Hey Siri" isn't working - Apple Support