Hello Justin Orr,
Focusing on org URL xxx.crm.dynamics.com and Telemetry ID = 020c0180-3a5f-4f05-8a79-a61a499d9d33, noticed this exception:
Stack Trace Info: [NullReferenceException: Object reference not set to an instance of an object.]
Based on the stack trace, the issue is coming from method SendEmailFieldProperties().
Apparently some reference for SendEmail step is null.
My first suggestion would be to remove and create again the SendEmail step.
If you need further help, I suggest you to raise a ticket with the Microsoft Dynamics 365 support team.
Full stack error:
MSCRM Error Report:
-------------------
Error: Exception of type 'System.Web.HttpUnhandledException' was thrown.
Error Message: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Error Details: Exception of type 'System.Web.HttpUnhandledException' was thrown.
Source File: Not available
Line Number: Not available
Request URL: xxx.crm.dynamics.com/.../entityform.aspx
Stack Trace Info: [NullReferenceException: Object reference not set to an instance of an object.]
at Microsoft.Crm.Web.Sfa.WorkflowEntityForm.SendEmailFieldProperties(CrmFormEventArgs e)
at Microsoft.Crm.Web.Sfa.WorkflowEntityForm.SetFieldProperties(Object sender, CrmFormEventArgs e)
at Microsoft.Crm.Application.Forms.EndUserForm.OnDataBound(CrmFormEventArgs e)
at Microsoft.Crm.Application.Forms.CustomizableForm.Execute(Entity entity, FormDescriptor fd, String quickFormUniqueId)
at Microsoft.Crm.Web.Sfa.EntityForm.ConfigureForm()
at Microsoft.Crm.Application.Controls.AppUIPage.OnPreRender(EventArgs e)
at Microsoft.Crm.Application.Controls.AppPage.OnPreRender(EventArgs e)
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
[HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown.]
at System.Web.UI.Page.HandleError(Exception e)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
at System.Web.UI.Page.ProcessRequest()
at System.Web.UI.Page.ProcessRequest(HttpContext context)
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step)
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)