router.asus.com : Why can't I log into my Asus router?

While registering your ASUS router in the ASUS account, make sure you fill up all the necessary details required in the provided fields. You also have to prove yourself that you are not a robot by fulfilling the task given to you by the router.asus.com interface. When you get successfully registered with the ASUS account an email will be sent to your registered mail id for verification purposes. Once you verify yourself, you will be eligible to add your ASUS product to the ASUS account.

https://httprouterasus.net/asus-router-login/