How to fix "activityStartTrigger: not whiteListed" on Unity android builds?

MONO_DEBUG=explicit-null-checks

AndroidJavaClass unityPlayer = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
AndroidJavaObject activity = unityPlayer.GetStatic<AndroidJavaObject>("currentActivity");
AndroidJavaObject context = activity.Call<AndroidJavaObject>("getApplicationContext");
AndroidJavaObject jo = new AndroidJavaObject("com.my.package.MyDbHelper", context);
string word = jo.Call<string>("returnData");
tx.text = word;

public class MySQLiteOpenHelper extends SQLiteOpenHelper {
    // implement as documentation describes, link is provided bellow
}

// this is the class, addressed from Unity
public class MyDbHelper{
    String str = null;
    private SQLiteDatabase db;
    MySQLiteOpenHelper mySQLiteOpenHelper;

    public myDbHelper(Context context) {
            mySQLiteOpenHelper = new mySQLiteOpenHelper(context);
            db = mySQLiteOpenHelper.getWritableDatabase();
    }

    // this is the method that unity calls
    public String returnData(){
        return queryAndDisplayAll();
    }

    private String queryAndDisplayAll() {
            // using Cursor and db perform query and get the result, say, in a str, and return it, that is like:
            // Cursor cursor = db.query(DicSQLiteOpenHelper.TABLE_NAME,...
            // str = ...result from Curson...
            return (str == null ? "No result!" : str);
    }