Gmail mailer authentication issue

[Teodor]

No, no no. You should NOT use setup mail step in the server action. Remove it from the server action.
Once you define the mailer globally, you just need a SEND MAIL step in the server action, referencing to the global mailer.
After you do that, please set this option back to 1:

public $SMTPDebug = 1;

And here's more info about globals:

Using Globals in Server Connect

Intro The Globals allow you to define and re-use Database Connections and other Settings (1), Variables / Input Parameters (2) and API Action Steps (3) across all your API Actions in the project: [Screenshot_2] Whenever you need a Database Connection, Mailer or Security Provider you just need to define them once in the Globals and they will be available for all your Server Actions in the project. Defining Global Variables / Input Parameters You can easily define a variable and access it f…