Thanks for bringing this up. It seems the custom URL you are trying to change it to is a little bit too generic. By any chance, have you already tried other custom URLs? Keep us posted.
@TeamYouTube @YTCreators @YouTube Is there a way I could change my custom link on Youtube to http://Youtube.com/agent ? For some reason it doesn't let me do it even though nobody has it.
Please 
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I had to add numbers so it became http://Youtube.com/agent0022 . I go by name AgeNT on all the platforms and it would be great if I could have agent on my URL too. Is there no way I could have it? It would help my channel a ton.
End of conversation
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