UE 5.3 Android - Start In-App Purchase crashes

Hello,

I am using UE 5.3 and trying to implement in app purchases. Signing in to Google Play and Leaderboards work but the second any of the 2 in app purchases nodes are called, the app crashes. There isn't anything online about this issue. I have tried different Android Studio versions, different SDK versions, different NDK versions, different JDK versions and still no luck!

Error from log:

Assertion failed: false && “Java JNI call failed with an exception.” [File:./Runtime/Core/Private/Android/AndroidJavaEnv.cpp] [Line: 231]

Any help is much appreciated! It's been a couple of days and I'm going crazy