Have you found pollen before? Took me quite a while to recognize the little grayish blob. Anyway, did the flowers get any water, rain, in them? That washes out the pollen.
Today I took my little toolbox the the Bot Gardens to try to pollinate a hot pink Adenium there, and none of the flowers had pollen. Sometimes this happens. Some believe that Adeniums that are being bred a lot are heading to being male/or/female plants. I have one plant that I'm finding only a pistil, the female part, with nothing inside but the little lump. Funny looking! I also have several plants, one a dramatic red, that never ever has pollen. I am beginning to make crosses with other reds, and double reds using this one as a pod parent. I think the Santa Claus doubles and triples are good pollen parents. Good boys!
Hope this helps!