Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32MG1B/EFR32MG1B632F256GM32/CMU/ROUTEPEN#0x0
I/O Routing Pin Enable Register
CLKOUT0 Pin Enable
CLKOUT1 Pin Enable
https://github.com/cmsis-svd/cmsis-svd-data