So I've set up the email approval server and I'm getting the email and they are being received back but the process is not moving forward. I went into the event viewer and noticed this error 

502200x80000000000000763LFFormsOPLSRFIAP01.deltakedu.corpAn unexpected error has occurred. [LFF502-UnexpectedError] Details: URL: Error: UnexpectedError Date: 3/27/2017 10:53:25 AM (Central Standard Time) HTTP Status Code: 500 Business Process ID: 0 Business Process Name: Stack Trace: Caught exception: Laserfiche.Forms.CommonUtils.Exceptions.LFFormsException Message: An unexpected error has occurred. [LFF502-UnexpectedError] Inner exception: System.Reflection.TargetInvocationException Message: Exception has been thrown by the target of an invocation. at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeConstructorInfo.Invoke(BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) at System.Security.Cryptography.CryptoConfig.CreateFromName(String name, Object[] args) at Limilabs.Mail.DKIM.DKIMHashAlgorithm.() at  .(DKIMHashAlgorithm , CanonicalizationType ) at Limilabs.Mail.MimeDocumentFactory.(DKIMSignatureInfo ,  ) at Limilabs.Mail.MimeDocumentFactory.(Byte[] ) at Limilabs.Mail.MimeDocumentFactory.CreateMimeDocument(Byte[] data) at Limilabs.Mail.MailFactory.CreateMail(Byte[] data) at Laserfiche.Forms.Routing.EmailApproval.PollingEmailInternal() Inner exception: System.InvalidOperationException Message: This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms. at System.Security.Cryptography.SHA256Managed..ctor() 

The bit at the end about FIPS stood out to me. I've this issue before and I needed a modified .exe file to remedy the issue. Could this be a similar case? I've set the polling to 5 mins in the approval settings.