Thanks,
After changing the Pre-Authorization to false. I'm able to see the consent page now.
![enter image description here](https://image.ibb.co/jaU317/Gluu.png "enter image title here")
![enter image description here](https://image.ibb.co/khqXuS/oxAuth.png "enter image title here")
If user click on "**Dont' Allow**" in the consent page, it will redirect user this page,
![enter image description here](https://image.ibb.co/dufnTn/Gluu_2.png "enter image title here")
Then when the user click on "**Return**", it will redirect user back to consent page again.
Is there any configuration that allow us to force user to re-authenticate again, instead of display the consent page directly.