Hello twanmal,
I'm sorry this happened to you, it's pretty common when buying things online.
yes, your device is having local warranty in Denmark and can only be serviced in Denmark.
Warranty can not be changed because it had been regulated according to the local regulation when sending out from factory,
and also possible that other country does not sell that particular product.
Please kindly contact our Denmark Team and arrange service for you.
https://www.asus.com/dk/support/Service-Center/DenmarkOr you may contact your seller as well, we do find some international sellers will help their customer to deal with cross country product they imported.
Thank you.