Activation lost after restoring system

Hi, Due the fact that I work with system development, I had to partition my ssd to allow me to have linux on this XPS 9570. I had to change the HD to AHCI mode and after that Windows was no longer booting, so I've tried to restore the system to see if it would fix (it didn't, I still had to reactivate raid mode, go to windows, msconfig.exe and set it to boot on safe mode, reboot, to into BIOS, enable AHCI and then boot into windows with safe mode, and only after that reboot the note in normal windows mode to get it running together with linux). My problem is that apparently after I've restored the system, my windows does not want to activate anymore. I don't know what to do as I did purchase this machine with a licensed version of Windows but can't find any activation code anywhere!