Hi,
Based on your description, you have bought the laptop with pre-installed Windows 10. Correct me if I am wrong.
If so, then you have an OEM license. When you bought your computer/laptop, the manufacturer (Dell) installed an OEM version of Windows 10. This type of license is tied directly to the device’s motherboard.
Source: What does OEM mean?
You need to clean install your laptop and select the right version (Windows 10 Home or Pro) where you first purchased your laptop.
How to Clean Install Windows 10
If you require further assistance, please don't hesitate to let me know.
Stay Safe!