I have created a user register controller to register users with repository design pattern. My controller looks like this.
[Route(\"api/[controller]\")]
i have same error, check maybe you put (AutoValidateAntiforgeryTokenAttribute) in AddMvc Services
services.AddMvc(opt => { //Prevent CSF Attake For POST,PUT,DELETE Verb //opt.Filters.Add(new AutoValidateAntiforgeryTokenAttribute()); })