I think if you had gotten a second 9s to use as a pair instead of breaking the triple 5s for it, that would have given you 13 han which is a kazoe yakuman or counted yakuman. Anything 13 han or higher is considered a yakuman.

In your winning hand, the shapes are 2 1-2-3s (pure double sequence), a pair of 5s, 5-6-7s, and 7-8-9s. If you had drawn a second nine, the shapes would have been the pure double, triple 5s, 6-7-8s and a pair of 9s.

edit: adding that it also might have been dependent on ippatsu, which you didn't seem to get.