Good question! Just to confirm, have you tried to proceed without entering extra characters? If not, this only means that the custom URL you're trying to request should have extra characters to make it unique. Learn more here: https://yt.be/help/4moa . Hope this helps.
@TeamYouTube Hello, is it possible to make your own URL without adding any extra characters?pic.twitter.com/vHdOMGGUZa
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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