while item, on which you trying to attach sound to, never was to the ground, sound will not be spawned on it

So, you either do hoops for example:

void CreateSomeSound()
{
    Object target = this;
    if (GetHierarchyRootPlayer()) { target = GetHierarchyRootPlayer(); }
    g_Game.CreateSoundOnObject(
        target,
        "soundname",
        1, false);
}

Or you somehow move item to the ground and back forth, but we understand, that it smells stinky.

Spawn item in inventory, then try to create sound on it.

void CreateSomeSound()
{
    g_Game.CreateSoundOnObject(
        this,
        "soundname",
        1, false);
}

You can move item in between any foreign or your own PlayerBase inventories, but this will not trigger correct sound creation.
ONLY ground will fix future sound creation, while in any inventory hierarchy.

Sound should be able to spawn on item in inventory.