Customizing the member approval email

Question:
Where can I find the link to edit the approval email that gets sent automatically when new members are approved?

Product:
Settings in my site’s dashboard

What are you trying to achieve:
We have a registration/approval flow initiated by our mobile app which talks to wix backend velo code on our site to handle the registration and approval functionality to make the mobile user a live member on our site. When the authentication.approveByToken() API is called, Wix automatically sends out an email to the user that was approved.

Here is the email that gets sent automatically when our backend function approves a pending member:

We want to modify the content of this email.

I am trying to follow the instructions in this article: Site Members: Customizing the Member Approval Email | Help Center | Wix.com

It states:

What have you already tried:
I go to the location mentioned in the article:

clicking on the above link shows:

There is no ‘Member approval email’ in any of these sections. The ‘Explore More Automations’ link likewise doesn’t have it:

Moreover - these automations have to be set up - the email I am trying to modify is already set up (must be a default behavior) and active.

Where do I go to modify the content of this email?