Hey Zacky,
I think you might wanna look at this,
Hope it helps!
Hello,
I usually generate a release version of AAB to distribute to the stores (you should generate an AAB instead of APK) using command line below:
cd {your template folder}\android\
.\gradlew.bat bundleAppstoreRelease
This command will generate an unsigned Release AAB in the folder below:
{your template folder}\android\app\build\outputs\bundle\appstoreRelease
But, in order to distribute to the AAB stores, you must sign the app.
https://developer.android.com/studio/publish/app-signing
Good luck!