Code
<%= form_tag otp_challenge_path, :method => :post, :class => "otp_form" do %>
<%= text_field_tag :code, nil, :autofocus => true,
:autocomplete => "one-time-code", :inputmode => "numeric" %>
<%= submit_tag "Log in" %>
<% end %>
Enter the six-digit code from your authenticator app.