Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Microchip Technology/ATSAMV71J20/PMC/CKGR_PLLAR#0x0
DIVA=_0
PLLA Register
PLLA Front End Divider
0 (_0): Divider output is 0 and PLLA is disabled.
1 (BYPASS): Divider is bypassed (divide by 1) and PLLA is enabled.
PLLA Counter
PLLA Multiplier
Must Be Set to 1
https://github.com/cmsis-svd/cmsis-svd-data