Please try to following;
- Close and reopen the app. Select “Add Scan” which should bring up the QR code. In case this doesn't please
- Delete the app from your phone, download again and reinstall. This should fix the problem and allow you to bring up the QR code when selecting Add Scan
If the problem occurs, please contact firstname.lastname@example.org and provide us with your phone model (i.e. iPhone X) an operating system (iOS 12.1.3) for us to investigate the issue further.