Pull up P0.08

Hi, 

I am trying to pull up P0.08 as an enable pin for this switch TPS7A0518 

I use the following code and verified on development board 

gpio_pin_configure(gpio0_dev, GPIO_0_TPS_EN, GPIO_OUTPUT);
gpio_pin_set(gpio0_dev, GPIO_0_TPS_EN, 1);

However, when I move to customized board, it does not work. I am providing a 1.8V source to VCC_NRF 

Anything else I should check or correct? 

Thank you

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