This has already been reported in this thread.
Norton VPN for Smart TV’s - Norton VPN for iOS | Android - Norton Community
The reviews on the Google Play Store are full of the same complaint about the QR code not working to activate the app.
My contact is looking into this. The last I heard, they thought it was something to do with the subscriptions you have active. The VPN feature for smart TVs is only available if you have a subscription to the standalone Norton Secure VPN. If you have a Norton 360 subscription, the QR code seems to be only picking up that subscription even if you also have a standalone subscription.
Either the Norton employee or myself will post into the thread I linked when there is any news on this.