Unable to reinstall Android app

HI all,

We have an issue installing our Android .apk onto our Android Pixel 2 device.  Here are the steps we are following:

1) Built the app in Ionic 'Ionic Cordova build android'

2) using Android Studio 3.4.1, we go to Build -> 'Generate Signed Bundle APK'

3) Select 'APK'

3) Create Keystore with same password for both Keystore and Key password

4) Choose a Release build variant with both V1 and V2 APK signature.

5) We upload to App47.  

Question:

A) Is this the correct Android build process for Enterprise distribution through App47

B) Do we need (should we) use the Android App-Resigning feature?

The problem is that wen we re-install the Android App, the app fails to install.  This happens BOTh when we install the app more than once, AND when we uninstall the app and resinstall (alll through App47).