Generic method parameter with generic property throws T does not contain a definition error

I'm trying to abstract a method that currently takes in 2 parameters. Both parameters are of Class SecureEmail<T>. Initially the types were specified, i want to make it generic now but i'm getting an error when assigning them, on the parameter that is also generic. I have added some code to explain below.

Initially AddInfo looked like this (Worked fine):

private void AddInfo(SecureEmail<emailforEmployees> email, SecureEmail<EmailtoAdmins>tempEmail)
{
  var emailtrail = new NotifyMe()
     {
	    emailrequetid = email.Model.emailrequetid
     }	 
}

I changed it to this:

private void AddInfo<T,U>(SecureEmail<T> email, SecureEmail<U>tempEmail)
{
  var emailtrail = new NotifyMe()
     {
	    emailrequetid = email.Model.emailrequetid //error on emailrequetid 
            // T does not contain a definition for emailrequstid and no accessible extension method '' accepting a first arugment 'T' could be found.
     }	 
}

public class Email
{
 public string from {get; set;}
}

public class SecureEmail<T> : Email
{
 public T Model {get; set;}
}

sendEmail(SecureEmail<TypeofEmail> email)
{
    var tempEmail = new SecureEmail<emailforEmployees>()
	{
	    //populate
	}
     
  tempEmail.Model = new EmailtoAdmins()
  {
     /////Popuilate Model
  }
  
  AddInfo(email, tempEmail)
}

I'm expecting to be able to call AddInfo and specify any type i want for T.

You need to use constraints to make sure, the emailrequetid is defined. For example, you could define following interface:

public interface ISpecific
{
    public string EmailRequestId { get; set; }
}

Then use it to specify the Model has property EmailRequestId:

private void AddInfo<T,U>(SecureEmail<T> email, SecureEmail<U>tempEmail)
    where T : ISpecific
{
    var emailTrail = new NotifyMe()
    {
        EmailRequestId = email.Model.EmailRequestId
    };
    // do something else
}

Instead of trying to use generics, its better to remove the dependency. I tested this and it cleaner:

private void AddInfo(NotifyMe emailtrail)
{
  Dosomething(emailtrail);
}

sendEmail(SecureEmail<TypeofEmail> email)
{
    var tempEmail = new SecureEmail<emailforEmployees>()
    {
        //populate
    }
     
  tempEmail.Model = new EmailtoAdmins()
  {
     /////Popuilate Model
  }
  
//move this here from Addinfo
var emailtrail = new NotifyMe()
         {
            emailrequetid = email.Model.emailrequetid //error on emailrequetid 
                // T does not contain a definition for emailrequstid and no accessible extension method '' accepting a first arugment 'T' could be found.
         }   

  AddInfo(emailtrail)
}