Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Infineon/XMC1200/PPB/NVIC_IPR6#0x0
Interrupt Priority Register 6
Priority, Byte Offset 0
Priority, Byte Offset 1
Priority, Byte Offset 2
Priority, Byte Offset 3
https://github.com/cmsis-svd/cmsis-svd-data