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There are several possible reasons for the absence of sound for PWA / web app notifications on iOS 16.4. Some common causes are:

1. Notification settings: Check if the notification settings for the PWA / web app are configured to allow sound. Go to Settings > Notifications > [App Name] and ensure that the Sounds toggle is turned on.

2. Do not disturb mode: Make sure that the iOS device is not in Do Not Disturb mode, which can silence all notifications. Go to Settings > Do Not Disturb and toggle off the feature.

3. Silent notifications: The PWA / web app notifications may be configured to be silent. Check if the app developer has set up the notifications to be silent by default or if there is an option to enable sound notifications.

4. Volume settings: Ensure that the volume on the iOS device is not turned down or muted, which can suppress notification sounds.

5. iOS version: Check if the iOS version is up to date or there any known bugs or issues with notifications. Check for updates to the iOS version and the PWA / web app.