hello krishnaprasad.k,
may I also know which JetPack release you’re using.
you’ll need to update pinmux spreadsheets since GPIO07 it’s by default configure as GPIO pin, i.e. modify GPIO3_PV.00
as PM3_PWM0
.
please see-also similar topics for using PWM on Nano.
for example, Topic 122492, Topic 157462.