"if you don't get authenticated in the next 48 hours..."
yeah. that sounds like a professional communication.
i got 8 out of 10 because i evaluated two "legitimate" emails as phishing. however i will say that i disagree with their assessment of #9. they judged the link as legitimate because mousing over it revealed a URL that started with https. this is not a guarantee and it's dangerous to trust that.
last year i received a legitimate seeming email from paypal that contained a link to an address that started with https://www.paypal.com
. turns out it was a masked URL. once clicked the URL then forwarded itself to a server based in japan. just mousing over the link and inspecting the URL is no way to guarantee your safety. you should still open a new browser window and enter the URL for the site manually.