@Juan Dent , Welcome to Microsoft Q&A, based on your picture, I find that your current app is a .net core console app.
As usual, Entity Framework is used for .NET Framework app. Also, Entity Framework Core is used for .NET Core app.
We need to use Entity Framework Core instead of Entity Framework.
However, we could see Microsoft Explained about the following sentence:
EF Core does not support the EDMX file format for models.
Therfore, you could refer to the Microsoft doc Getting Started with EF Core on ASP.NET Core with an Existing Database to scaffold a database context from an existing database or create a new model and use migrations to create and update databases.
Hope the above link could help you.
Best Regards,
Jack
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