Program.cs

builder.Services.AddControllers().AddJsonOptions(options =>
    options.JsonSerializerOptions.Converters.Add(new JsonStringEnumConverter())
).ConfigureApiBehaviorOptions(option =>
{
    option.InvalidModelStateResponseFactory = context =>
    {
        string errorInfo = string.Empty;
        try
        {
            if (context.ModelState.Count > 0 && context.ModelState.First().Value != null && context.ModelState.First().Value?.Errors.Count > 0)
            {
                errorInfo = context.ModelState.First().Value?.Errors.First().ErrorMessage ?? string.Empty;
            }
        }
        catch (Exception ex)
        {
            errorInfo = $"Issue reading errorInfo {ex}";
        }

        Console.Error.WriteLine(errorInfo);

        return new BadRequestObjectResult(context.ModelState);
    };
});