Two accounts with same User E-Mail

I am trying to setup a multi-tenant app where each tenant is represented by an Account

Upon signup via Jumpstarts Users::RegistrationsController an Account and associated Owner (a User) is created.

Accounts are separated by path

I want to achieve the following:
An Account Owner should be able to sign up again, with the same E-Mail address, and create a second Account and AccountUser entry without creating a second User . This would allow one User to own several accounts. Currently validations on Users::RegistrationsController#create fail if  a User with the same E-Mail address already exists.

So I tried to edit the `Users::RegistrationsController#build_resource` method as follows:

def build_resource(hash = {})

    # resource = User

    existing_user = User.find_by(email: hash.dig(:email))

    # Jumpstart: Skip email confirmation on registration.

    #   Require confirmation when user changes their email only

    resource.skip_confirmation!

    # Registering to accept an invitation should display the invitation on sign up

    if params[:invite] && (invite = AccountInvitation.find_by(token: params[:invite]))

      @account_invitation = invite

    # Build and display account fields in registration form if enabled

    elsif Jumpstart.config.register_with_account?

      account = resource.owned_accounts.select(&:new_record?).first

      account ||= resource.owned_accounts.new

      account.account_users.new(user: resource, admin: true)

    end

  end

Problem:
New Account and AccountUser rows are not created. But I can't figure out whats wrong.

Has anybody already implemented this behavior?

Looks like you're close. I'd put a byebug in the controller and run the lines manually to see if you can figure out where it's not working.