Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Silicon Labs/Series1/EFR32FG1P/EFR32FG1P131F128GM48/ADC0/SCANMASK#0x0
Scan Sequence Input Mask Register
Scan Sequence Input Mask
https://github.com/cmsis-svd/cmsis-svd-data