When you first turned on the Surface did it go through the setup routine I mentioned. Asked for Language, Keyboard setup, Wi-Fi, and then an account?
There is a specific forum for Surface devices and someone there may be able to help better.
Results in Surface - Microsoft Community or you can edit your original post and change the forum.
Sorry I was forgetting this is not your thread but you have asked in another user thread.
In addition. There should be a 25 character licence key in the bios, you can access that as follows.
To check open the Terminal (Admin) prompt again and enter
wmic path SoftwareLicensingService get OA3xOriginalProductKey [press return] If it displays a 25 character licence key then get ShowKeyPlus from the Store and enter the key in Check edition.
If the key comes back as Windows 7 or 8 then that cannot be used to activation Windows 10 or 11.