Steps:

1. Change the edition using the generic key
   DISM.exe /online /Set-Edition:ServerStandard /AcceptEula /ProductKey:N69G4-B89J2-4G8F4-WWYCC-J464C
2. Uninstall generic key
   slmgr /upk
3. Then update the key
   slmgr /ipk (youroriginalkey)
4. To activate
   slmgr /ato

KMS activation keys
https://learn.microsoft.com/en-us/windows-server/get-started/kms-client-activation-keys