Issues with the Turris App

I have installed the Turris App on an Android 6.0.1 phone recently. The app is in version 1.0.4. Unfortunately I can’t connect it to the router. The app is not able to open the camera to scan the QR code although the permissions are OK.
Is there an alternative way to grant the app access to the router?

Thank you, it has worked with QR Droid.

Can someone add solved to this? This was the hint I needed as well.