您需要在身份验证中间件 app.UseAuthorization()之前添加 app.UseAuthentication()将处理JWT承载身份验证，验证和解码令牌，最后写入用户的原则.

You need to add app.UseAuthentication() before app.UseAuthorization() , the authentication middleware will handle the JWT bearer authentication , validate and decode token , at last write to user's principle.