Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Microchip Technology/ATSAME51J19A/USB/HOST/CTRLA#0x0
MODE=DEVICE
Control A
Software Reset
Enable
Run in Standby Mode
Operating Mode
0 (DEVICE): Device Mode
1 (HOST): Host Mode
https://github.com/cmsis-svd/cmsis-svd-data