Account permanently suspended, I have no idea why

I tried to log into my account today, it said my account had been permanently suspended. I checked my email for anything, but all I could find was an email that said I needed to enter a code into a security dialog (I also have no idea how that got there.) Please help, I'm very confused ps: there was absolutely no info on why I was banned anywhere.

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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