Try the troubleshooting steps here first: https://yt.be/help/sWdH . Once done, follow these instructions to see how you can remove your old custom URL & claim a new one: https://yt.be/help/4moa . Note that you can only remove a custom URL up to 3 times per year. Keep us posted!
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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