Good Afternoon Dario.
From within the link as provided earlier, for this step 3:
3. On the Mail Trigger dialog, General Properties tab, complete the fields as appropriate.
Default Trigger Process (Orchestrator only)
Specifies how to handle emails that have invalid XML content in the message body or attachment.
Values:
* Blank - Ignore the emails with no valid XML trigger content.
* The full path of the process that the Domain Orchestrator is to start. (One default process can be defined for each Orchestrator.)
Choose the 2nd option: full path > click the spyglass and select 'ca-slcm/emailapproval'.
As shown in the document I attached.
Thanks and kind regards, Louis.