@Vikki13: Please try opening the Camera app > Tap the cog in the top left > Scan QR codes, and make sure that this option is toggled on. Furthermore, swipe from the top of the screen to the bottom, then again to enlarge the Quick Panel, and tap on 'Scan QR code' to open the scanner.
If the issue persists, close the Camera app and head to Settings > Apps > Camera > Force stop > Storage > Clear cache, then restart your Galaxy S23 (press and hold the Side button > Restart).
@Vikki13: If you're still experiencing issues, try taking a photo of the QR code then head to your Gallery app, select the image of the code, tap the Bixby Vision icon (it looks like an eye), then select 'Lens' to allow Bixby to read the code a redirect you to the URL. You can also access Bixby Vision via the Camera app > Scroll to 'More' > Bixby Vision. Simply enable all pop up permissions, then select the QR code symbol at the bottom of the screen.
