Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32f0/STM32F0x1/I2C1/OAR2#0x0
Own address register 2
Interface address
Own Address 2 masks
Own Address 2 enable
https://github.com/modm-io/cmsis-svd-stm32