Hi Sathees - thanks for the quick help. For your first point, does that only apply if it's being used to start the journey? or does that mean at any place in the journey, we can't reference data from those datasets?this journey itself starts with a different activity, based on if someone completes a...

I need to create a unitary event to reach profiles who clicked on an email that was placed earlier in the journey. I can't use a reaction event activity because the reaction activity isn't placed directly after the email I'm looking to act on which is why I am creating a unitary event to look at the...

What happens to the original members of the first audience when they get to the audience qualification activity in your screenshot? do they exit the journey at that step or do they proceed through that activity to the second email activity? 

We have a live journey where members were not receiving the email as expected (unitary event/triggered). A day later, they received the email and the message feedback status was equal to "delay". Is there any in depth explanation to why a delay would happen?