Forbidden / prohibitory Symbol at startup (Windows to MacOS Dualboot)

Hey,

so I wanted to have MacOS on my Windows for video editing and stuff. But after following guides and making my EFI I get this forbidden / prohibitory symbol

https://preview.redd.it/dm7slhigycue1.png?width=1280&format=png&auto=webp&s=c438efdff20893b7598652390fa9f702a996eb87