Identity column is not being modified by the Entity framework

The corresponding object looks like this:

public class FieldBookingDateRange : ITimeStamps, ICreatedBy, ISoftDeletable
{
    [Key, DatabaseGenerated( DatabaseGeneratedOption.None )]
    public int FieldBookingDateRangeID { get; set; }

    [Required]
    public virtual FieldBooking FieldBooking { get; set; }

    public virtual DateRange DateRange { get; set; }

    ....
}

      

        
        
        
      

    

I have a database column that is currently set to Identity: true.

If I run the following auto-generated migration on it (this should be setting the column to false for identification):

public partial class RemovedDBGen_FieldBookingDateRange : DbMigration
{
    public override void Up()
    {
        DropIndex("dbo.FieldBookingDateRanges", new[] { "FieldBookingDateRangeID" });
        DropPrimaryKey("dbo.FieldBookingDateRanges");
        AlterColumn("dbo.FieldBookingDateRanges", "FieldBookingDateRangeID", c => c.Int(nullable: false, identity: false));
        AddPrimaryKey("dbo.FieldBookingDateRanges", "FieldBookingDateRangeID");
        CreateIndex("dbo.FieldBookingDateRanges", "FieldBookingDateRangeID");
    }

    public override void Down()
    {
        DropIndex("dbo.FieldBookingDateRanges", new[] { "FieldBookingDateRangeID" });
        DropPrimaryKey("dbo.FieldBookingDateRanges");
        AlterColumn("dbo.FieldBookingDateRanges", "FieldBookingDateRangeID", c => c.Int(nullable: false, identity: true));
        AddPrimaryKey("dbo.FieldBookingDateRanges", "FieldBookingDateRangeID");
        CreateIndex("dbo.FieldBookingDateRanges", "FieldBookingDateRangeID");
    }
}

      

        
        
        
      

    

It doesn't do anything ... But it doesn't fail.

Any ideas why this isn't working?

SQL output -Verbose

IF EXISTS (
    SELECT name FROM sys.indexes 
    WHERE 
        name = N'IX_FieldBookingDateRangeID' AND 
        object_id = object_id(N'[dbo].[FieldBookingDateRanges]', N'U')
)
DROP INDEX [IX_FieldBookingDateRangeID] ON [dbo].[FieldBookingDateRanges]
ALTER TABLE [dbo].[FieldBookingDateRanges] DROP CONSTRAINT [PK_dbo.FieldBookingDateRanges]
ALTER TABLE [dbo].[FieldBookingDateRanges] ALTER COLUMN [FieldBookingDateRangeID] [int] NOT NULL
ALTER TABLE [dbo].[FieldBookingDateRanges] ADD CONSTRAINT [PK_dbo.FieldBookingDateRanges] PRIMARY KEY ([FieldBookingDateRangeID])
CREATE INDEX [IX_FieldBookingDateRangeID] ON [dbo].[FieldBookingDateRanges]([FieldBookingDateRangeID])