As an admin, login to G-Suite console (https://admin.google.com/u/2/ac/home) - you should see something like this:

Open security settings (hamburger menu - security - settings) - you should see something like this

Click API permissions

Click Trusted apps

You should see something like this:

Click on yellow + to add Zapflow as trusted app


Select web application as application type


Enter Zapflow application OAuth2 Client ID as

826010690104-uj22ep02jimb905l1kikbvpeuo7j8ck6.apps.googleusercontent.com

and click Add button. 

Now everything should be set.

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