Writing a SmsServiceProvider.dll extension

I've written a SmsServiceProvider.dll class to work with the SMS OTP, and now I've stumbled across this error when resetting my password:

 

Microsoft.IdentityManagement.SmsServiceProviderManager: System.TypeLoadException: An error occurred while loading the custom SMS provider DLL.  Please review the inner exception details. ---> System.TypeLoadException: The custom SMS provider DLL does not implement the required interface.

   at Microsoft.IdentityManagement.SmsServiceProvider.SmsServiceProviderManager.InitializeSmsServiceProvider()

   --- End of inner exception stack trace ---

   at Microsoft.IdentityManagement.SmsServiceProvider.SmsServiceProviderManager.InitializeSmsServiceProvider()

   at Microsoft.IdentityManagement.SmsServiceProvider.SmsServiceProviderManager.get_ExternalSmsServiceProviderExists()

   at Microsoft.ResourceManagement.Workflow.Hosting.SmsNotificationServiceImpl.SendSmsMessage(String mobileNumber, String message, Guid requestId, Dictionary`2 deliveryAttributes)

   at Microsoft.ResourceManagement.Workflow.Activities.OneTimePasswordSmsAuthenticationGate.SendOneTimePassword(String plainTextOneTimePassword)

Now the weird thing is that I've seen this in the beginning when fooling around, but then it started working. Now all of a sudden no matter what I do it just doesnt want to work.

Here's my code, a bit stripped though

using System;
using System.Collections.Generic;
using System.Globalization;
using Microsoft.IdentityManagement.SmsServiceProvider;
using System.Diagnostics;
using System.Configuration;
using Shared.DataContracts;
using System.Reflection;

namespace FIM.SmsServiceProvider
{
    public class SmsServiceProvider : ISmsServiceProvider
    {
        readonly static TraceSource trace = new TraceSource("SmsServiceProvider", SourceLevels.All);

        public void SendSms(string mobileNumber,
                            string message,
                            Guid requestId,
                            Dictionary<string, object> deliveryAttributes)
        {
//some logging stripped                
mySMSProvider.SendSms(ui, message);            
            }            
        }       
    }

    class mySMSProvider
    {
        readonly static TraceSource trace = new TraceSource("SmsServiceProvider", SourceLevels.All);

        mySMSProvider()
        {
        }

        public static int SendSms(UserInfo ui, string message)
        {
           //send sms logic stripped
            return 1;
        }

        //public static string GetRequestData(string mobile, string message)
        //{
        //    return "";
        //}        

        //public void GetCredentials()
        //{
        //}       
    };
}

This is really really weird, as the only method to implement for that Interface is sendSMS which to me seems pretty present in the code...

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