Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32h7/STM32H723/Ethernet_MAC/MACL4A1R#0x0
Layer 4 address filter 1 register
L4SP1
L4DP1
https://github.com/modm-io/cmsis-svd-stm32