Hello ASUS! I bought a ASUS ROG monitor and got a promotional code. (Printed on the receipt).
I went to the site for registration in the Nordic Region which is as follows: (I live in Norway).

https://promotion.asus.com/en/nordics/call-of-duty-black-ops-4-dominate-with-the-best

I have entered ALL the required information and tripple checked every detail to make sure everything
is correct. But when I get to the page where you choose Product and then enter Serial Number, I get an
error message stating: "Please enter a valid serial number".

As I said, I have checked many times that I am entering the correct product and serial number, but the
registration fails every time. 😞

Please help!

Thank you in advance.

- UPDATE: ISSUE FIXED! -
Decided to try one more time and for some reason the registration now completed and I have received my
activation code and have Call of Duty installed on my Battle.net!

Thank you for quick fix Asus! 😄