We'd suggest waiting for 24-48 hours from the time you changed the custom URL as it takes time for the changes to be updated. In case the issue still persists after that, let us know and we'll investigate it further.
@TeamYouTube So, I just claimed my custom url and when you actually go on it, it directs to a page that just says "This channel does not exist."
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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