Hacker News with Generative AI: Online Identity

My legal last name prevents me from completing my Twitch affiliate onboarding (reddit.com)
Hi, I recently completed all four prerequisites for Twitch Affiliate. Naturally, I began my onboarding, and I filled in my information the way it is supposed to be filled in. However, when I reach step 4, I am unable to continue on due to my last name. My last name is Null, a programming term that also means invalid. When I input my name, I get this prompt showing that it is a null value rather than my name.
Ask HN: Real name vs. anonymous username – which do you use online and why? (ycombinator.com)
Do you use your real name or an anonymous username when signing up for and using various online platforms—such as Hacker News, Twitter, Discord, and others?