I created a basic form following the instructions provided by your team, including setting up a Sen Grid API account and using it within the backend. My tests show no emails being sent to the customer (for now, me), however, they do show up in the database. I have another site in which I am testing a somewhat similar form and it seems to work.
What I just noticed is that through Send Grid, all of my submit email attempts have been blocked. Would you know why that is happening with this site, but not the other? Thank you!