Verify that your operating system on your phone / tablet is supported by KRY's app (iOS (v.9.0 or later) or Android (v.5.0 or later).
Check your internet connection. For example, check if the mobile data is on or off for the KRY app.
You can also try to update the KRY app in the app store or Google Play, and restart the app.
Please contact KRY Support for further assistance:
E-mail: firstname.lastname@example.org, Phone: 08-22 77 07
KRY Support is open weekdays at 9.00-17.00.