There are several error codes that could appear when activating your key.
0xc004f050 code means that your key is suitable for a different software version than the one installed on the device. You will need to install the correct version of the software or contact our support.
0xc004C008 code means that the key requires phone activation. However, it does not require any phone calls. You can do that by pressing the Windows key and R key at the same time. That will open a new window in which you have to type in “SLUI 04”. (Without quotation marks) You can then generate the Confirmation ID using our Milo chat bot, or simply provide us with a screenshot of it in the Resolution Center report
0xc004C003/060 codes mean that the key cannot be activated. In order to seek a solution, please open a Resolution Center report https://www.kinguin.net/app/dashboard/rc and provide us with a screenshot of your activation screen: https://gyazo.com/4fc093e68bb2d1d89b8e123d49ec0622
In case of any other codes, please report your problem via the Resolution Center