Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Microchip Technology/ATSAME51J19A/OSCCTRL/DFLLCTRLB#0x0
DFLL48M Control B
Operating Mode Selection
Stable DFLL Frequency
Lose Lock After Wake
USB Clock Recovery Mode
Chill Cycle Disable
Quick Lock Disable
Bypass Coarse Lock
Wait Lock
https://github.com/cmsis-svd/cmsis-svd-data