@Rory McMahon
Hi,
According to the error code, that means the KMS client cannot find KMS server resource records (SRV RRs) in DNS.
If you’re using a laptop and don’t know your product key, since you got the winodws pre-activated in it, you’ll need to run following command in a separate “command prompt” window and do open “command prompt” with administrator access.
powershell "(Get-WmiObject -query ‘select * from SoftwareLicensingService’).OA3xOriginalProductKey"
Press enter, and output would be your Windows activation product key.
While being at Desktop, press windows key + R.
A “Run” windows should open and write down following command:
Slui 3
ress enter and wait for a window to appear.
That window should ask you for entering your operating system activation product key.
Enter the product key you’ve got.
After entering product key, Click “Activate” button.
Hope above information can help you.
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread