DanEDU index of not working?

hello, I have a simple enough task to find the imbedded indicies of these numbers, which I thought the DanEDU index of node did, can anyone tell me what I am doing wrong? Ive tried almost all the list levels. thanks!

The node is not intended to take lists as the ‘element’ input…

…but in combination with list level can you get an ‘element’ inside a list as an individual element

However, no matter how you put it, you always need to ensure you are searching for elements of the same type. In my presentation I had to cast the output from the “List.MaximumItem” node to integers since my list of elements is integers.