If you see an 'unrecognised' status message when you enter a creative code snippet, DFP doesn't recognise the snippet. As a result, you must manually insert click and cache-busting macros into the snippet.
To proceed, click Manually insert macros to insert click and cache-busting macros into your code snippet.
Not all ad tags currently support click tracking; therefore, inserting the DFP click macro may cause the tag to fail.