Flutter Implementation for Edge not working on Android

Hi everyone,

for a client with a mobile App written in Flutter we've created an analytics setup that works via the edge network. 

The App(s) use Edge Bridge to forward Analytics trackStates/trackActions through the edge network. Everything seems to be working as expected for the iOS version, however the Android version doesn't send any data or any requests. We can see the data appearing in Assurance sessions (which are using a different channel to forward data) but nothing in Analytics. 

The developers use this package https://pub.dev/packages/flutter_aepedge to implement in Flutter, with some initialization code in Kotlin (Swift for iOS off course, but, code is identical as far as possible). We've checked the code, compared it to examples / documentation and even presented it to someone at Adobe but nothing seems to work.

Does anyone have experience with this kind of setup, this kind of problem or can give me a hint ?

Thanks in advance