Following the Odo comment https://github.com/odoo/odoo/pull/129562#discussion_r1306030434 We need to ensure that we have a default user for the mobile SelfOrder when no session is open. If we don't have a user, the system will be in sudo mode and the price calculation will be erroneous because the system has chosen the wrong taxes: it doesn't know which company to use to calculate the taxes. We now force the setting of a default user for pos_config with mobile selfOrder enabled, so that when no session is open, the default user will be used. closes odoo/odoo#134273 Signed-off-by: Joseph Caburnay (jcb) <jcb@odoo.com>