Open Settings on your iPhone
Tap Notifications
Tap Announce Notifications
Turn off Announce Notifications
Or turn off Announce Notifications for specific apps
Open Settings
Tap Siri & Search
Tap Announce Notifications
Turn off Announce Notifications with Siri
Put AirPods in your ears
Open Control Center
Tap the Announce Notifications icon to turn it off
On Apple Watch, open Settings
Tap Notifications
Turn off Announce Notifications
On Mac, open System Settings
Click Notifications
Turn off Announce notifications if enabled
Check your AirPods settings in Bluetooth
Tap the info button next to your AirPods
Turn off any notification announcement options if shown