Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/stm32/stm32n6/STM32N645/DBGMCU/DBGMCU_DBG_AUTH_DEV#0x0
DBGMCU device authentication register
Mailbox between debugger and processor
https://github.com/modm-io/cmsis-svd-stm32