Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Atmel/ATSAM4S4B/PMC/PMC_WPMR#0x0
Write Protection Mode Register
Write Protection Enable
Write Protection Key
5262659 (PASSWD): Writing any other value in this field aborts the write operation of the WPEN bit. Always reads as 0.
https://github.com/cmsis-svd/cmsis-svd-data