Hello ladysaraha,
Though "Hey Siri" may be working, we want you to follow the steps in this article any way: If "Hey Siri" isn't working on your iPhone. In particular, follow the steps under 'Set up "Hey Siri" to help Siri recognize your voice' to turn off then set up "Hey Siri" as new. Test for resolution after that.
"Set up Siri to recognize your voice
- Go to Settings.
- Tap Siri & Search.
- Turn off Listen for "Hey Siri," then turn it back on.
- When the Set Up "Hey Siri" screen appears, tap Continue.
- Say each command that you see on your screen.
- Tap Done."
We also recommend restarting your device and keeping it updated as those steps assure you have cleared out any minor software issues and are running the most current version.
Restart your iPhone - Apple Support
Update your iPhone or iPad - Apple Support
If you still have questions, reach out to Apple Support directly, as this may require closer guidance: Get Support
Cheers!