Obscure email

Hi,
I wanted to use the Obscure email stack in combination with two TCMS fields but it seems not to work on my site. Anyone tried this?
The obscure email stack provides extra security by splitting an email in 2 parts

partA@partB

So I made 2 TCMS fields for each part and put the TCMSfield codes in the obscure email stack. Am I doing something wrong?

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