S5D9 UID

Hello,

I want to get the unique id in the s5d9 mcu, I use g_fmi_on_fmi.uniqueIdGet(&p_unique_id), using this api I can get the id successfully, but when I check the ssp user manul 2.4.0,

4.2.22.3 FMI HAL Module Operational Overview

it said “For the S5D9 MCU, the fmi_api_t::uniqueIdGet API returns an error. There is no workaround."  

Why i didn't get the error? it return 0, whitch means sucess