Custom email template throwing error on 9.3.3

I have a simple process with a custom email template file. When adding this additional notification to an action, the action fails to launch.

Process_CreateInstance at Advantys.Workflow.Engine.NotificationsManager.WriteEmailNotificationLog(String logLevel, String notificationType, String senderEmail, String senderName, String recipientEmail, String recipientName, Nullable`1 recipientId, Nullable`1 delegatorId, MailMessage message, String threadIndex, Exception exception) at Advantys.Workflow.Engine.NotificationsManager.SendMailNotification(MailMessage message, String recipientName, String recipientEmail, Nullable`1 recipientUserId, Nullable`1 delegatorUserId, String threadIndex, String notificationType) at Advantys.Workflow.Engine.NotificationsManager.SendActionAdditionalNotifications(Int32 processInstanceId, Int32 activityInstanceId, NotificationType notificationType, WorkflowException workflowException) at Advantys.Workflow.Engine.WorkflowsManager.SendNewActionNotifications(Int32 processInstanceId, Int32 newActivityInstanceId, WorkflowUserIdentity connectedUser, Boolean isNotifyPullOrToAssign, Boolean isNotifyToDo, String assignType, Int32 userIdAssigneeDb, Boolean isAssignmentError) at Advantys.Workflow.Engine.WorkflowsManager.CreateAction(Int32 processInstanceId, Int32 processId, Int32 activityId, WorkflowUserIdentity requester, WorkflowUserIdentity connectedUser, Int32 assigneeId, Int32 directLoopCount, Nullable`1 blockId, Nullable`1 parentBlockId) at Advantys.Workflow.Engine.WorkflowsManager.CreateActions(WorkflowUserIdentity connectedUser, Int32 processInstanceId, Int32 processId, Int32 activityId, WorkflowUserIdentity requester, Int32 directLoopCount, Nullable`1 blockId, Nullable`1 parentBlockId) at Advantys.Workflow.Engine.WorkflowsManager.CreateActionsOnRequestCreated(Int32 processInstanceId, WorkflowUserIdentity connectedUser, WorkflowUserIdentity requester) at Advantys.Workflow.Engine.WorkflowsManager.HandleOnRequestCreated(Int32 processInstanceId, WorkflowUserIdentity connectedUser, WorkflowUserIdentity requester) at Advantys.Workflow.Engine.WorkflowsManager.CreateRequest(DataRow process, WorkflowUserIdentity requester, WorkflowUserIdentity connectedUser, DataSet context, DataRow action) at Advantys.Workflow.Engine.WorkflowsManager.CreateRequest(Int32 processId, WorkflowUserIdentity requester, WorkflowUserIdentity connectedUser, DataSet context) at Advantys.Workflow.Web.UI.Portal.ProcessPages.ProcessStart(PageController pageController)

Just confirming that the exact same process works in v8.3.3.

I also tried on 9.3.2 and it crashes.

Hello,

We want to investigate this issue more closely.

Can you open a ticket in our helpdesk to investigate this issue?

Regards,
Lynn

Opened a support ticket.

Hello,

Can you tell me the Zendesk ticket number so I can make a follow-up on the issue?

Regards,
Lynn

I have to go through Intellera support. I can ask them to forward you the ticket.