Hi @Simon-Liu ,
Thank you for your interest in the NXP S32K product, I would like to provide service for you!
It means, to functional reset + standby, the CLKOUT function just works on GPIO[12], you can consider, GPIO[138] can't support it the function reset+standby at the same time, it should just works on the standby mode.
Wish it helps you!
Best Regards,
kerry