The QR code isn't updating, or the security guard can't scan it

If users report that the QR code isn't updating or that the security guard's app isn't reading it: 1) Ask them to restart the security guard's device. 2) Verify that the security guard's app is up to date. In testing (Android 12, using both the user who reported the issue and a test account), the QR code works correctly after a restart.