The webbsida is strange Is it hacked???
May you be more specific or share a link and screenshot?
I have the same problem trying to register my XT8. If you enter the serial number on the product registration page for your account, it seems to validate it by automatically selecting the appropriate product type and product name in the dropboxes below the serial number. Once you complete and submit the form, however, the page displays a "Serial number incorrect!" message.
I guess there's some internal issue from server
use this website to check warranty ,
Official Support | ASUS India
Please kindly share the website link and the SN in the PM I send you.
I will check with related or local team to understand more.
Still doesn't work. I can't register my XT8 router
Please kindly share the SN in the PM I send you.