Windows Not Activated on my new laptop

So I've recently purchased a new Dell Inspiron 14 5000 (5480) in November and had it arrive in mid December. I had it set up and it was working all fine. After a few days later I noticed a watermark on the bottom left of my screen and I went ahead and checked it and somehow did something to get rid of it. At first I thought it was some minor glitch with Windows, but to reinforce what I thought was correct I went to setting and checked the status and it says "Windows is activated with a digital licence linked to your Microsoft account." I searched up what exactly this means and found that it only happens if a major hardware or software update has been made, but from what I'm aware of I haven't done any of this to my new laptop. Could someone please help me.