The Google Assistant needs permission to access many different systems on your phone. For example, you need to access the microphone, or you won't be able to hear your voice commands at all.
If the Google Assistant voice commands don't work on your phone, the first thing to do is check the permissions. If you find that any of the permissions is disabled, enabling them will probably fix the problem.
The Google Assistant works through the Google app, so you must ensure that the Google app has access to your microphone at least if you want it to respond to your voice. If you want me to be able to do something useful, be sure to enable all permissions.
Here's how to access the permission settings for your Google app:
1. Open the Settings app and tap Apps & notifications.
2. In the application's information list, touch Google.
3. Touch Permissions.
4. If any of the slide switches is gray, touch them to slide them to the right. Make sure all the sliders are turned on and check if the Google Assistant voice commands work.
5. If the Google Assistant still doesn't respond to your voice, try restarting your phone after you've enabled all the app permissions. If it still doesn't work after that, you'll need to make sure that the "Okay Google" command is actually enabled.
Make sure the "Okay Google" command is enabled
The Google Assistant can accept both voice commands and text commands, so it comes with the option to disable voice commands. If you want it to respond to voice commands, you need to make sure that the "Okay Google" command is enabled in your Google app settings.
1. Open the Google app and tap More to open the Google app settings menu.
Depending on which version of the Google app you have, you may see ⋮ (three vertical dots) or (three vertical lines), and you may or may not see the More text.
2. Touch Settings.
3. Touch Voice.
4. Make sure the Voice Match Access and Voice Match Unlock sliders are both slid to the right. If either switch slides to the left and appears dimmed, touch it. You can save some time by tapping Retraining the voice model right now and retraining the voice model. More instructions are available in the next section.
5. Check if the Google Assistant voice controls work. If it still doesn't respond, you'll need to retrain the voice model.
https://www.keyquery.com/internet/google-assistant-not-working/