unable to set the visible property of pivot items class

Hi Experts,

Currently facing a strange problem with my pivot code.
Here i'm just trying to hide the unwanted dates(items) it's working fine in my system.
When we try to run the same code in my colleague's system its not working though we are using the same Office that is 2010.

Kindly help me how to rectify it.

Problematic code.

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can you provide a sample workbook? by the way your 'with pf' block isn't doing anything and can be removed