Hello, This is Elijah.
The Xbox Series X will sometimes glitch out and provide no in-game audio when using "Quick Resume". I have experience with these issues. Also, make sure there are no outstanding updates as well. There are two ways to fix it.
1. A Hard Reset, which is unplugging your Xbox Series X from the power source, waiting 60 seconds, then plugging it back in.
2. A factory reset may be needed to solve this issue.
Press the Xbox button to open the guide.
Select Profile & system > Settings > System > Console info.
Select Reset console.
On the Reset your console? screen, you'll see three options:
Reset and remove everything. This option resets the console to factory settings. All user data, including accounts, saved games, settings, home Xbox associations, and all games and apps will be deleted. Use this option when selling or gifting the console, or as a last resort in some troubleshooting cases.
Reset and keep my games & apps. Use this option as your primary choice when troubleshooting. It resets the OS and deletes all potentially corrupted data without deleting your games or apps. In some cases, if a corrupt game file is causing the issue you're troubleshooting, you may have to choose Reset and remove everything, but you should always start with Reset and keep my games & apps.
Cancel. To back out of this screen, simply select the Cancel button. No action has been taken at this point. This is a safe exit from this screen.