Pow API email confirmation doesn't update "email_confirmed_at"

I followed this guide: https://github.com/mreishus/notebook-pub/blob/master/programming/phoenix/pow/adding-email-confirmation-to-an-api.md

Everything seems to work and I get an email and upon clicking it the expected message:

{"success":{"message":"Email confirmed"}}

The only problem is that in DB, the user row isn’t updated. So there is still email_confirmation_token filled but email_confirmed_at stays NULL.

If I use this line manually(in console): PowEmailConfirmation.Ecto.Context.confirm_email(user, %{}, otp_app: :my_app) it works.

2021-01-07-101559_554x456_scrot

In the screen above, the last one was manually approved and the previous 2 were via link.