I’m creating two flows: Flow A for people who order product A and Flow B for people who order product B. I would like to prevent people who order both product A and B from entering both flows. I believe this should be possible using the flow filter ‘Received email where flow equals X zero times over all time’.

At the moment, neither flow A nor flow B are showing up as options when I try to enter their names in the box shown above. Currently both flows are set to draft and no emails have been sent from either flow. Will they only show up once at least one email has been sent? Or is there another way to set this filter up in advance of making the flows go live?