There're few things you could try If you're receiving an error when trying to setup your gmail account as a custom email address;

Generate an app password for Plutio and use the app password in plutio email settings instead of the email password.

Allow per-user outbound gateways

Turn off 2-Step Verification.

Allow the access from the less secure app. The activity may show from an Unknown Device.

Enable "less secure apps".

Unlock

It is recommend using smtp.gmail.com or smtp-relay.gmail.com as the server relay for when connecting a GSuite account. Please try both.
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