Saranya at Roku support helped me through this issue. I was stubborn to the fact a different email would work, but the activation came through instantly on my wife's email. I have not found the exact reason, but noreply@roku .com was being blocked at an upper level in my spam settings and I never saw any email come in, even to my spam folder. I would suggest going to your "allowed" senders, whitelist, or whatever name your email service gives to trusted incoming mail, and make sure noreply@roku .com (no spaces) is added to your list. Another suggestion might be to temporarily lower your "threshold level" (name my service provider gives to security level) and see if that will allow the activation email to come through.
