Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/EFR32BG22C224F512GM32/SMU_S/ESAUMRB56#0x0
Specify the boundary between regions 5 and 6.
Moveable Region Boundary 5-6
https://github.com/cmsis-svd/cmsis-svd-data