@maggiethecat: To begin with, please open the Camera app, tap the cog symbol and make sure that 'Scan QR Codes' is toggled on. Now, swipe from the top of the screen to the bottom using 2 fingers, select 'Scan QR Code' from the Quick Panel, scan the QR code, tap on the pop up and the link will open.
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. I hope this helps.
