How to enable Migrations for Identity in Asp.net MVC

I need to unbind Identity from my Asp.net core MVC layer and throw it to another crosscutting layer of my DDD project. Based on Eduardo Pires' Equinox project, I managed to do it, but I'm finding it difficult to activate Migrations. For you to understand what I did:

1 - I created the SystemComercial.Presentation.Web.MVC layer with user authentication. Automatically, the system has created several folders, controllers, and classes necessary for authentication to work, including the local database. Fantastic !!!!

2-IcreatedaSystemComercial.Infra.CrossCutting.Identity.Datalayerandmanually,Icreatedthesamefolders,controllersandclassesofthemvclayer.TheideaistoactivateMigrationsonthislayerandthenIremoveeverythingfromtheMVClayerandinthisway,theoperationwouldbedecoupledandontheIdentitylayer.

WhenItrytorun"Add-Migration InitialCreate -Context: ApplicationDbContext", the following error message appears:

  

Microsoft.AspNetCore.DataProtection.KeyManagement.XmlKeyManager [0]         User profile is available. Using 'C: * \ Local \ ASP.NET \ DataProtection-Keys' as key repository and Windows   DPAPI to encrypt keys at rest. More than one DbContext named   'ApplicationDbContext' was found. Specify which one to use by   providing its fully qualified name using its exact case.

 //Minha classe de contexto na camada Identity
 
 public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
            : base(options)
        {

        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            // get the configuration from the app settings
            var config = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json")
                .Build();

            // define the database to use
            optionsBuilder.UseNpgsql(config.GetConnectionString("DefaultConnectionpg"));
        }
        
    }

Does anyone know how to help me to activate Migrations in the created Identity layer?

Project link: link