In the "Get a custom URL" box, you'll see the custom URL(s) you've been approved for. You can't change the part in the gray box, but you may need to add a few letters or numbers to make the URL unique to you. More info here: https://yt.be/help/4moa . Hope this helps.
We've passed this along to our team. They'll get back to you via email linked to your channel. Appreciate your patience in the meantime.
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