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RM48L952: Unable to write PCSPWRDWNSET0/1

Part Number: RM48L952

Hello,

To apply the PCR Access management (INC2 from the RM48 safety manual spnu577d) I am trying to disable peripherals which I am not using.
To do this I have first written 0xFFFFFFFF to PCS[31-0]PROTCLR.
I read back both PCS[31-0]PROTSET and CLR to be 0x00000000.
After this I write my value (0x800000C0) to PCSPWRDWNSET0 and ~(0x800000C0) to PCSPWRDWNCLR0.
However, neither of these actions seem to impact the PCSPWRDWNSET0 register. PCSPDWNSET0 and CLR0 remain 0x00000000.
How can I change these bits?

Thanks and best regards,

Karel