How to create database migration when application has two dbcontext in ASP.NET core 3 ?

See more:

C#

SQL

database

ASP.NET-Core

I am using Asp net core 3 application visual studio it has the following :

project as RazorPages with the structure wwwroot, Models, Pages, Services, appsettings, Startup, and Program

Folders:

- Model => PrimaryDBContext => It is my primary DBcontext, I need to set up this context in Startup as primary and the context from DataService as secondary

- Services => DataService: It has the secondary DBContext (I have it as my secondary context from a main project that contains Users (table) ). I use this DBContext for Login (to claim user identity) to use it only for email and Password credentials.

-appsettings => It has the two connections string for my primary and secondary context


The issue is when I want to create migration is says that there is a conflict between the context. It does not allow to create the migration for the project.

How could I set up my primary context and secondary context to create migration?
(I don't want to include secondary context for migration)

How could I define in the project that my primary context is the context to pick up for the migration?

thank you in advance

What I have tried:

//In Startup I set up ConnStrings

 public void ConfigureServices(IServiceCollection services)
{

services.AddScoped<IDataService, DataService>();

services.AddDbContext<PrimaryDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("PrimaryDbConnString")));

services.AddScoped<SecondaryDbContext>(options => new SecondaryDbContext(Configuration.GetConnectionString("SecondaryConnString")));


}