Today you install Windows Server 2019，When ready to change the key to start Windows，But out of the key error message，After confirming that several sequence numbers are correct，For error code 0X80070490 (Or 0XC004E028) Crawl on the Internet，But only found information related with Windows Update，Later for Windows Server 2019 To query，Sure enough, to find a lot of foreign people experience the same situation with me，The cause is still not sure，But the solution is not difficult，As long as the instruction to change the way you can change the key。
◎Open the command prompt as a system administrator，Enter the command
slmgr.vbs -ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
◎ then go after confirmation，Windows is complete Enabled。
【參考連結】
- Windows Server 2019: Error 0x80070490 When Activating Windows | Basics for Computer Nerds!
