How can I prevent the automated "You Have a New Site Member Request!" email?

I have automated a flow for creating a new site member on my website when done through my mobile app. This is all working fine. However, I still get the above mentioned email sent to the Admin account. Presumably this is because I have it set up as a “manual approve” process, but the “manual approval” process in this case is actually done by the user and my back-end functions when they properly pass through the two-factor authentication I’ve set up through the mobile app.

How can I turn off getting that automated email?