Hi there! I understand you're having trouble getting the NASCAR app scanner to work on your Mac with OS X 10.15.7. Could you tell me a bit more about what's happening exactly? For example, are you seeing an error message, or is the scanner just not playing audio at all? Also, are you using the NASCAR app through a browser or the native app?

Meanwhile, here are some general steps tailored for your setup that often resolve scanner issues:

1. Confirm you are logged into a verified NASCAR.com account. The scanner requires account verification to work properly.
2. Since you're on macOS 10.15.7, please make sure your browser is updated to the latest version you can run on that OS (Safari, Chrome, or Firefox). Running an outdated browser can interfere with the scanner functionality.
3. Refresh the browser page where the scanner is running.
4. Clear your browser's cache, as cached data can sometimes cause conflicts. On Safari, for example, you can do this by clicking Safari > Preferences > Privacy > Manage Website Data > Remove All.
5. Restart your Mac, then try accessing the scanner again.
6. If you are using any browser extensions that block audio or scripts, disable those temporarily to see if they affect the scanner.

If after these steps the scanner still isn’t working, please let me know exactly what you see or hear, and we can go deeper into troubleshooting or look at your NASCAR app version and network connection.

Are you currently using the scanner via the NASCAR web app or the standalone app on your Mac? This info will help me assist you better.