Inheritance and composite foreign keys - one part of the key in base class, the other part in derived class

I am having problems to create an Entity Framework Code-First mapping for the following sample database schema (in SQL Server):

Every table contains a TenantId which is part of all (composite) primary and foreign keys (Multi-Tenancy).

A Company is either a Customer or a Supplier and I try to model this via Table-Per-Type (TPT) inheritance mapping:

public abstract class Company
{
    public int TenantId { get; set; }
    public int CompanyId { get; set; }

    public int AddressId { get; set; }
    public Address Address { get; set; }
}

public class Customer : Company
{
    public string CustomerName { get; set; }

    public int SalesPersonId { get; set; }
    public Person SalesPerson { get; set; }
}

public class Supplier : Company
{
    public string SupplierName { get; set; }
}

Mapping with Fluent API:

modelBuilder.Entity<Company>()
    .HasKey(c => new { c.TenantId, c.CompanyId });

modelBuilder.Entity<Customer>()
    .ToTable("Customers");

modelBuilder.Entity<Supplier>()
    .ToTable("Suppliers");

The base table Companies has a one-to-many relationship to an Address (every company has an address, no matter if customer or supplier) and I can create a mapping for this association:

 modelBuilder.Entity<Company>()
     .HasRequired(c => c.Address)
     .WithMany()
     .HasForeignKey(c => new { c.TenantId, c.AddressId });

The foreign key is composed of one part of the primary key - the TenantId - and a separate column - the AddressId. This works.

As you can see in the database schema, from d