How can I construct a data model to bind to a SQL table with an XML column

I'm trying to use ASP.NET Core to read from a SQL database. I'm using Microsoft.EntityFrameworkCore.DbContext and I have it working except for any tables that have an XML column

When try and read from one of these tables I get the following error:

System.InvalidOperationException
  HResult=0x80131509
  Message=The entity type 'SqlXml' requires a primary key to be defined. If you intended to use a keyless entity type call 'HasNoKey()'.

I know this isn't talking about my model as it does have a primary key. It seems to be talking about the SqlXml class.

How can I construct a data model to bind to a SQL table with an XML column?

The DBContext

    public class HistoryContext : DbContext
    {
        public HistoryContext(DbContextOptions<HistoryContext> options) : base(options)
        {

        }

        public DbSet<ShWorkflowRunsModel> shWorkflowRuns { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<ShWorkflowRunsModel>().ToTable("sh_workflowRuns");
        }
    }

The Model

    public class ShWorkflowRunsModel
    {
        [Key]
        public Int64 runId { get; set; }
        public Guid serviceId { get; set; }
        public string serviceName { get; set; }
        public Guid workflowId { get; set; }
        public SqlXml workflowConfig { get; set; }
        public DateTime startTime { get; set; }
        public DateTime endTime { get; set; }
        public bool isScheduled { get; set; }
        public string errorMessage { get; set; }
        public bool hasErrorCounters { get; set; }
    }

The Controller

    public class WorkflowController : Controller
    {
        private HistoryContext _context;

        public WorkflowController(HistoryContext context)
        {
            _context = context;
        }

        public IActionResult History(string workflowId)
        {
            List<ShWorkflowRunsModel> model = GetShWorkflowRuns(workflowId);
            return View(model);
        }

        public List<ShWorkflowRunsModel> GetShWorkflowRuns(string workflowId)
        {
            return _context.shWorkflowRuns.Where(wr => wr.workflowId.ToString() == workflowId).ToList();
        }

    }
}

The SQL table definition

CREATE TABLE [dbo].[sh_workflowRuns](
    [runId] [bigint] IDENTITY(1,1) NOT NULL,
    [serviceId] [uniqueidentifier] NOT NULL,
    [serviceName] [nvarchar](1024) NULL,
    [workflowId] [uniqueidentifier] NOT NULL,
    [workflowConfig] [xml] NOT NULL,
    [startTime] [datetime] NULL,
    [endTime] [datetime] NULL,
    [isScheduled] [bit] NULL,
    [errorMessage] [nvarchar](1024) NULL,
    [hasErrorCounters] [bit] NULL,
 CONSTRAINT [PK_sh_workflowRuns] PRIMARY KEY CLUSTERED 
(
    [runId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

Please let me know if you need more information