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I can't actually remember who is the person who I requested the invite from, I think they were given out somewhat freely by some users.

You can look on your user page, or search for your username on the user tree page.

I did, but I can't say who that username is

Well, that would be an awkward DM to write. "Hello, you invited me to the website, but I don't actually know who you are."

Modern problems...