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Hi Cush5555, as boybinary said for some people the avatar banner appears automatically, but not immediately. I have noticed some people though that are passed level 10100 that haven't yet received their level 10,000 avatar banner.
With the recent introduction of the Milestone Challenge it could be that people no longer receive the banner automatically, but have to complete an event instead to receive something they have already achieved
Have you got the new Milestone Challenge event in your game? If you haven't then just keep playing and hopefully your banner will turn up