I found an error in my deploy. The problem has been handled. Thanks!
I have a mobile application, if the mobile application uses the APIs deployed from .Web.Host, the mobile application uses it normally. If I don't deployed the .Web.Host, configure the mobile to use the .Web.Mvc APIs, the mobile app won't run. What configuration do I need to add to .Web.Mvc for its APIs to work like APIs on .Web.Host.