I created a flow that is triggered when a new SharePoint item is created. It sends an approval email.
Now, I'm creating another flow triggered if the SP item is modified. Basically, if the user chooses to cancel the request before it can be approved -- I want the flow to "reply to the [approval email]" to cancel the request. But, where do I get the Message ID of the [approval email] sent on another flow?
I thought of saving the message ID to my SP item to be retrieved by my 2nd flow but can't find the message ID to save. Or am I misunderstanding the purpose of this [Reply to email] action?

Thank you