Greetings MDodd1221,
We understand that Search is not working as expected on your iPhone 12. You've completed some great troubleshooting steps so far. We'd like to provide you with a few more steps that may help resolve the issue:
• Verify that your settings are correct:
1. Go to Settings and tap Siri & Search.
2. Scroll down and select an app.
3. Then select Show App in Search, Show Content in Search, Show on Home Screen, Suggest App, or Suggest Notifications.
To turn off Siri Suggestions for all apps, go to Settings > Siri & Search, and turn off the settings you want.
• Make sure that your device is running the latest iOS version. Completing this steps ensures that your iPhone has all the latest fixes. Be sure to secure your data with a backup before proceeding: Update your iPhone or iPad
Best wishes!