Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/STMicroelectronics/STM32H7x5_CM7/Ethernet_MAC/MACL4A0R#0x0
Layer4 address filter 0 register
L4SP0
L4DP0
https://github.com/cmsis-svd/cmsis-svd-data