We have just been approved for the Summary Large Image card but have been unable to get our images to display in either the card validator or inside our tweets although the rest of the information works fine. We realize there are minimum size requirements for the photos used in these cards and as per those specifications we have ensured our images are larger in both height and width. They are served from a CDN but our domain is approved for *.insiderperks.com so that should not be a concern.
Below are two examples urls with markup where everything works except the image:
Could someone please advise if we have overlooked something in the code or image type?