Unable to set visible property of pivotitem

I have a pivottable based on data.

I am iterating over the pivotitems twice: First iteration: set all to visible Second iterationg: set all but desired to Visible=False

Now - I am getting an error that my code is trying to set all elements (Visible=False).

When i look at the pivot manually i do not see my element in the sub-filter list, but when I search for the item (using the pivottable magnifying glass/search) i find the item in the list.

Has anyone experienced this?