Buds 4 pro

Hi @Ellin, thanks for reaching out to the Samsung Community. I love the voice command feature on our Galaxy Buds, It's frustrating for features to not work so we definitely need to get that working for you again! I have some steps you can try.

If you go into the Wearables App> Settings> Earbuds Settings you should see the option for "Voice Controls" when you go into that you will see an option "Voice Commands" that's what needs to be turned on. 

I will link a video we have that shows exactly how to turn this on and make sure its set correctly

https://www.youtube.com/watch?v=fTYAZEYorns&t=187s

If this is on, and It's still not working you, may need to do a simple restart:

Insert the earbuds into the charging case and close the lid. Wait at least seven seconds, and then remove the earbuds. They will restart and automatically reconnect to your device.

Lastly you can always perform a Factory Reset of the Buds through the wearables app Tap About earbuds> Tap Reset earbuds, and then tap Reset again to confirm.

This link will list the steps with a visual.

 https://www.samsung.com/us/support/troubleshooting/TSG01218103/

Please let me know if any of this works for you!