Hi! I see you're having an issue where the Lyra app plays songs but there's no sound. I'd love to help you with this.

To start off, can you tell me if the sound is missing only in Lyra or in other apps too? Also, is your iPhone connected to any Bluetooth device, headphones, or external speakers right now? This can sometimes affect where the audio is directed.

While waiting for your reply, here are some initial troubleshooting steps that often resolve this kind of problem on iPhone with iOS 18.6:

1. Check Volume and Mute Switch
- Make sure your iPhone's volume is turned up using the side volume buttons.
- Ensure the mute switch (above volume buttons) is not set to silent (orange visible).

2. Check Playback Route
- During playback in Lyra, open Control Center by swiping down from top-right corner of your screen.
- Tap the audio output icon (looks like a triangle with circles) and verify that it's set to iPhone speakers or the preferred output device.

3. Restart the Lyra App
- Swipe up from bottom (or double-click Home button if your device has one) to open app switcher.
- Swipe the Lyra app off the screen to close it completely, then re-open it and try playing music again.

4. Restart your iPhone
- Hold the side button and volume up button together until you see the power off slider. Slide to power off, wait 30 seconds, then turn it back on.

5. Check Lyra App Permissions
- Go to Settings > Lyra and ensure Microphone and other relevant permissions are enabled.

If checking these doesn't fix it, you might want to check if the Lyra app itself needs an update or if there’s any ongoing server issues with Lyra. Sometimes a recent update fixes bugs related to playback2 5.

Let me know if the sound works after trying these or if you notice anything unusual during these steps. I’m here to assist further!