Getting 404 error instead of 401, when token is expired or when token is not passed

i am working with aspnet core WEB Api application.

To maintain security in my application, i am generating JWT token as access_token. and i am sending this token along with request headers.

i have added [Authorize] tag in controller method.

when i am sending request with out token or invalid token, i am getting 404 error instead of 401 error.

In statup.cs file
i have added a "app.UseIdentity();". This is required for signInManger to validate login.

if i remove "app.UseIdentity();" i am getting 401 error.

can any one help me out regarding this .. i want to use both JWT Token validation and Identity.