Hi Nejc,
Welcome to Microsoft Q&A forum. I'm happy to help.
This issue is caused by secure boot certificate issue. Normally, it can be fixed by updating to latest BIOS Firmware version. Please make sure that your device is running latest BIOS firmware.
Many users have reported the same problem even their secure boot certificate has been updated. I did some research and found a thread that may help you. Please visit how to fix this Secure Boot certificates | Razer Insider.
Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate and safe information. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
If the method on the thread cannot help, please contact Razer for further assistance. They will be the best to support you.
I hope that above information is helpful to you.