That’s not a feature of Event Espresso, it doesn’t have any connection with memberships, roles etc at all so all of the above is from the S2Member plugin.
It looks like you just add that function to your site, and $message text to whatever you want to use, however, you’ll need to contact S2Member for further support on this and its not from EE.
The support post ‘How to send an email when a specific membership level is changed?’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.