Doesn't send devise's confirmation email

[Frexuz]

Seems like one_time_mailings don't work.
Sidekiq and paperboy are started

Screens:

17 minutes Ago? But stilll 'Scheduled'? Sounds wrong

Log says:

2016-07-05T16:17:15Z 13465 [Maily#app] DEBUG: Attempt to deliver email without schedule. No mail was sent: <User#3> Kristian Gerardsson ["[email protected]"], <MailyHerald::OneTimeMailing#1> <OneTimeMailing: Confirmation Instructions>

Without schedule? It has mailing.start_at = Proc.new { |user| user.created_at } exactly copied from the wiki page.

What am I missing? (PS: AD HOC emails work fine)