The support agents wont be able to fix this issue on their own, axd23.

The majority of users who've reported missing video rewards actually experienced a delay in the reward's distribution.
In some cases there is legitimate concern. Now what the reasons for missing video rewards are several:
1) Issue with the streaming client of the provider - A video might not play out at all, starting up with an error message.
2) Issue with the video data itself - A video can give an error while playing or at the very end.
3) Connection issues among the line that can cause number 2)

Unfortunately we can't fix these issues from our side. We don't provide the videos. When we get reports about an issue with any video, the support agents then attempt to find out the provider of the video with the help of the Player who contacted them. They will then escalate the matter further when enough evidence is gathered and we contact the provider of the video so they can investigate on their end.