At the bottom of the page above they also state..
Mobile devices compatible with the Signia app 2.5.10 and higher:
Apple devices: The Signia app is compatible with all Apple devices with the iOS version 13.0 and higher.
Android devices: The Signia app is compatible with most of the Android devices (Android 8.0 and higher) ."
So, in order to get the APP to work, you are most likely going to have to find a older APP version..
On edit..
Forgot to mention, Motorola phones are not on their "supported" list..
I am taking the above to mean they are compatible with Android 8