Responsive Google DFP Ads?

[XFFA.IR Bot]

Hi all, trying to get my ads to become responsive, and I've followed some guides. Something is clearly off. I'm trying to get my ad in Container Header to pull different sizes depending on size.

This seems to just be pulling 728x90 though, no matter what I do.

Any DFP experts see anything here I'm doing wrong?

Here is the code in Header

Code:

  var mappingAZ_Forum_Leaderboards = googletag.sizeMapping().
        addSize([1100, 0], [970, 90] [728, 90]).
        addSize([750, 0], [[468...

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