I had a similar experience. I like making distribution lists with the company name, so cloudflare@domain.com. I suspect something in their system thinks these are test emails and I could never receive any email. I couldn't verify my email and I couldn't log in to contact support. I eventually emailed them, but they basically responded to login and get support, which was never going to happen since I wasn't receiving emails from them. Sad thing for Cloudflare, I was representing a large client that was exploring an enterprise contract but I could never get an account setup and verified to evaluate Cloudflare.