Hi mukul4,
Are you using the devkit or custom board for Orin NX?
What’s the Jetpack version in use?
Please share the full dmesg and device tree for further check.
You can refer to the following thread for the similar use case.
PPS input to GPIO on Jetpack 6.1 - #8 by erik93
Pps_gpio interrupt not asserted - #8 by KevinFFF