.NET Modelstate does not apply validation

Hello, I'm currently developing my first .NET web api/Angular project. I'm nearly done with it, currently developing the test project but I'm facing a problem with this create function. I'm trying to test if it throws an error when i leave the name property out (which is required), but my modelstate does not stop it. (Modelstate remains empty) However, when I test this manually in my front end, the validation does work. I'm using angular as front end. You can check out my code in the screenshots.