EF6迁移MVC5标识2.1 - 多重性在角色中无效

I basically have a new MVC5/EF6 (individual user authentication) project and I'm trying to slightly modify the Identity Users table to include an Id for Country, State and City. I was able to create the new columns successfully through EF Migrations, but upon trying to add the FK constraints I hit a road block. I added a CountryId, StateId and CityId to the default Identity Users SQL table all set as a nullable Int value.I basically have a new MVC5/EF6 (individual use