Hi there – you should've received a notification in Creator Studio as soon as it is available. Since it's been more than a week now, we recommend you reach out to Creator Support team here: https://yt.be/help/partners Congrats and hope you get it soon!
@TeamYouTube
Dear YouTube Team,
My channel have crossed 100k+ subscribers on 17th October 2019 but still I have not received any notification from YouTube for silver button rewards. Therefore I request you to verify my channel and give me reward notification as soon as possible.
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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