Your attachment is in the docx format, so it can't contain the ContentControlOnExit macro. Unless you added the ContentControlOnExit macro to the 'ThisDocument' code module of the document's template, therefore, you would lose its functionality as soon as you close the document. If you don' want to do that, you'll need to save the document in the docm format (i.e. as a macro-enabled document), with the ContentControlOnExit macro to the 'ThisDocument' code module of the document itself.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]