If the laptop was brand new when you bought it and pre-installed with Windows 10 then the manufacturer would have embedded the licence in the bios.
To check if there is a licence in the bios open PowerShell (Admin) and enter
wmic path SoftwareLicensingService get OA3xOriginalProductKey [press return] To check the product key displayed get ShowKeyPlus from the windows Store and enter the key into Check edition.
Does it confirm a Windows 10 licence in the detail.?