Hi, not sure if you are still having this problem, but I just came across it today and figured it out, and didn't see a regular solution here. In twitch, it says to input your first and last name. For me, I put my first and middle name in the "First name" box, and my last name in the other like normal. So if the name was John Jay Doe, in the first name I put "Jon Jay" and it worked for me. I hope that helps.
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