Trying to write STM32L462CE options Byte. Modification is never set in flash after LAUNCH or POwer cycle.

Here is what my code looks like:

FLASH_OBProgramInitTypeDef pOBInit;

pOBInit.USERConfig = FLASH_OB_GetUser();

HAL_FLASH_Unlock();

HAL_FLASH_OB_Unlock();

pOBInit.OptionType = OPTIONBYTE_USER;

pOBInit.USERType  = OB_USER_IWDG_STOP;

pOBInit.USERConfig &= ~(FLASH_OPTR_IWDG_STOP);  // FREEZE during STOP

//pOBInit.USERConfig |=  OB_USER_IWDG_STOP; // RUN during STOP

HAL_FLASHEx_OBProgram(&pOBInit);

HAL_FLASH_OB_Launch(); // Should reset MCU(Cf RM0351 p 114)