JsonObject.GetValueByKey Nested

I am trying to use the nested function in the JsonObject.GetValueByKey node with the key input as a string with keys concatenated by a period as stated in the package guidance, but it is not working for me. Can anyone point out what I am doing wrong.

there are some online json path evaluators which are handy- you paste in your json- then either test a path expression, or determine the path of a particular object

the Dynamo nodes JsonObject.Values and JsonObject.Keys can also be handy in working it out

I know what keys i need… if you look at the original post when the keys are pulled one at a time it works, but if it is done all at once it doesn’t work for me.