I had the same problem. I changed my E-mail address, and it didn't confirm it properly, so whenever I submitted a PIREP, it went into the database to see what E-mail address I had, and since it hadn't confirmed it, the PIREP could not be sent.
Since you haven't changed your E-mail, I think there's just a problem with the E-mail confirmation button, since you did press it. Maybe every time you press that button, it's meant to send the new info, but it doesn't get sent properly