Blazor 8.0 - issues using DataAnnotationValidator and ValidationSummary

I am currently following a tutorial to learn Blazor (I'm working in 8.0).I have a MessageWall.razor file, containing:

    @page "/MessageWall"<h3>MessageWall</h3><EditForm Model="model" OnValidSubmit="ValidSubmission" FormName="MessageWallForm"><DataAnnotationsValidator /><ValidationSummary /><label for="message" class="form-label">@nameof(model.Message)</label><InputText id="message" @bind-Value="model.Message" class="form-control" /><button class="btn btn-primary" type="submit">Submit</button></EditForm><ul>        @foreach (string message in messages)        {<li>@message</li>        }</ul>    @code {        private MessageModel model = new();        private List<string> messages = new();        private void ValidSubmission()        {            messages.Add(model.Message);            model = new();        }    }

and a MessageModel.cs (contained within a Models folder, which I added to @_Imports.razor using @using BlazorServerMessageWall.Models):

namespace BlazorServerMessageWall.Models;public class MessageModel{    [Required]    [StringLength(10, MinimumLength = 5)]    public string Message { get; set; }}

When I fire up the application, and enter a valid entry (eg; "hello", "123456") I get "The Message field is required."Really baffled here, read through the documentation. What am I doing incorrectly? Nothing in the console to indicate there are any problems.