Hello MissingLinks62,
Welcome to Apple Support Communities!
We want to make sure you've lowered the volume all the way while the ad is playing, as this might help.
This Apple Support page has more details to Adjust the volume on iPhone - Apple Support
Also, per the link:
Important: Clock alarms, audio apps such as Music, and many games play sounds through the built-in speaker, even when silent mode is on. In some countries or regions, the sound effects for Camera, Voice Memos, and Emergency Alerts are played, even when the Ring/Silent switch is set to silent.
If this is the case, feedback directly to Apple about the situation is your best option: Product Feedback - Apple
Or if you feel the app isn't working as expected, try the steps here for the app: If an app on your iPhone or iPad stops responding, closes unexpectedly, or won’t open - Apple Support
These steps can help make sure the software is updated and working as expected.
Please let us know if you have further questions.
Cheers!