Shit site, you can't even set up an account. They also close tickets without notice and without solving problems. They really don't care about the costumers.
Edit: They ask for a 6 months old account in another seller website with feedbacks, so, if it's the first time you're selling your account then they'll just tell you to fu and reject. They also don't say which are the so called "red flags". In any case, I don't really care if they accept or not, I will never sell any account in their website full of bs and poor costumer service.