Have you previously used video clips?
If not suggest reading this https://www.ebay.co.uk/help/sr?query=videos+on+ads.&origin=1&aiSummary=true
Otherwise I cannot think of a reason for not allowing your video, as it would be decided by AI as I cannot think they are vetted by a human. I have seen other members having problems just using pictures of dolls, so it may just be the doll that presents the problem.
