ASP.NET Misconfiguration Improper Model Validation (CWE ID 1174)

I am creating an ASP.NET MVC application.

I have a model with data annotations like this:

public class SearchModel  
{
    [MaxLength(11)]
    public string? SSN { get; set; } = string.Empty;
}

And I have a controller method that receives an object of this type as parameter:

public async Task<IActionResult> Search([Bind(include: "SSN")] SearchModel searchModel)
{
    // do something
}

I get a Veracode error

ASP.NET misconfiguration : improper model validation (CWE ID 1174)

on the definition of the method...

Testing.. If I replace SearchModel with String, it works. So the problem is the model definition, but I added the data annotations to the property.

What else can I check?

Thanks