Dell Rewards in Alienware Arena not in Dell account?

Hi, there.

I just earned $25 Dell Rewards after signing up Alienware Arena account using the same email of my Dell account. I can see the $25 Dell Rewards in my Alienware Arena account now, but I cannot see it in my Dell account.

Is this something wrong? I want to spend the Dell Rewards now. How can I use it in my Dell account? Thank you!