https://community.shopify.com/c/shopify-flow-app/error-at-last-step-quot-send-marketing-email-quot/m-p/2230287/highlight/true#M2440 Try selecting "Customers subscribed to email marketing"

 This is it! (hopefully) Thank you so much for tracking this down for me 

Here's the workflow, tried to move the blocks around so that they fit in the screen...   And this is the email setup...   

Hey TJ, I'm still seeing this. I had a poke in the email app, notification settings , etc but didn't see anything that would fix it. What I ended up doing this morning is to default new customers to also be subscribers, which might be dodgy but I wou...

Thank you for the insight, however I'm saying what I've noticed.Never had the old abandoned checkout erroring on me with this error.So obviously something has changed.

This is because of the "new" way requiring consent to sending marketing emails.The "legacy" way didn't use to require this.I think Shopify is just playing it safe with this one whilst we are losing potential sales. 