ClassNotFoundException: Didn't find class "com.vivox.sdk.JniHelpers"

Fresh new project freshly linked to my dashboard account.

Nothing special , and using the sample project. It works fine on Editor just not on Play.

My unity: 2021.3.4f1
Vivox: Version 15.1.190200-pre.1

Any idea?

2022/12/20 19:39:38.026 26739 26793 Error Unity AndroidJavaException: java.lang.NoClassDefFoundError: Failed resolution of: Lcom/vivox/sdk/JniHelpers;
2022/12/20 19:39:38.026 26739 26793 Error Unity java.lang.NoClassDefFoundError: Failed resolution of: Lcom/vivox/sdk/JniHelpers;
2022/12/20 19:39:38.026 26739 26793 Error Unity at com.vivox.vivoxnative.VivoxNative.init(VivoxNative.java:11)
2022/12/20 19:39:38.026 26739 26793 Error Unity at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
2022/12/20 19:39:38.026 26739 26793 Error Unity at com.unity3d.player.UnityPlayer.access$300(Unknown Source:0)
2022/12/20 19:39:38.026 26739 26793 Error Unity at com.unity3d.player.UnityPlayer$e$1.handleMessage(Unknown Source:95)
2022/12/20 19:39:38.026 26739 26793 Error Unity at android.os.Handler.dispatchMessage(Handler.java:102)
2022/12/20 19:39:38.026 26739 26793 Error Unity at android.os.Looper.loopOnce(Looper.java:226)
2022/12/20 19:39:38.026 26739 26793 Error Unity at android.os.Looper.loop(Looper.java:313)
2022/12/20 19:39:38.026 26739 26793 Error Unity at com.unity3d.player.UnityPlayer$e.run(Unknown Source:20)
2022/12/20 19:39:38.026 26739 26793 Error Unity Caused by: java.lang.ClassNotFoundException: Didn’t find class “com.vivox.sdk.JniHelpers” on path: DexPathList[[zip file “/data/app/~~3tdMzlVBI4z_hsHd1ylC_g==/com.DefaultCompany.Myproject6-iYOMIV5CTp00krxUzi0lAw==/base.apk”],nativeLibraryDirectories=[/data/app/~~3tdMzlVBI4z_hsHd1ylC_g==/com.DefaultCompany.Myproject6-iYOMIV5CTp00krxUzi0lAw==/lib/arm, /data/app/~~3td

its fixed. It turns out it was due to the build setting set as mono (not il2cpp)