Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32u5/STM32U535/RAMCFG/M5IER#0x0
RAMCFG SRAM x interrupt enable register
SEIE
DEIE
ECCNMI
https://github.com/modm-io/cmsis-svd-stm32