Since January 2020, users are required to validate their IAP account via SMS code validation. This new behaviour needed to be properly ported to the client to correctly inform the user. This commit adds support of a new failure_type: 'Unregistered Account'. Task #2209567 closes odoo/odoo#48512 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>