Yes you do have a valid license. I know MS had some problems with their activation servers 2 or 3 weeks ago and it was supposed to be fixed. The problem may be back. Follow the link below. If that does not work, I would be contacting MS for help. I believe when it comes to the OS, Dell will pass the responsibility back to MS. [URL]
HI all, I have purchased a new Dell G7 15 gaming series machine. Product activation for Windows 10 fails because of the following error: "We can't activate WIndows on this device because you don't have a valid digital license or product key. Error code: 0xC004C003". I am supposed to have a valid digital license as stated on my BOM - requesting your help/suggestions on this. Thanks in advance for the help !!  
Windows 10 activation fails for my new Dell G7 15 machine