call ms support. win+x to run command prompt (admin). type slui 4. in the country field, select malaysia. in the next page there will be a 1800 number for you to call. don't close the dialog until activation is completed.
no. it's not the same key, because during the clean install, you *do not* need to use any key. all you need to do is to install w10, skip any place that ask you for key. after successful install, connect to the internet and w10 will be activated automatically. yes, no key is needed.

that ms.tech probably is still not aware of what's going on. it's a new activation system, at least for this free upgrade offer of w10.