Postman SMTP on Contact Form 7

Yes, before I start, I know. There are a lot of topic related to this, but, I did all of them and nothing works as of this moment. Now, let me tell my story:

I am using Contact Form 7. Yes, Good ol contact form 7. And then stumbled upon so many SMTP and every single plugin there. I also the problem is the email should go to Gmail. Yes, another facepalm. This is the only one I can run to, the POSTMAN and yet I get no result.

I deactivated all the plugins. Only remains is Contact form 7, it says thank you blah blah, but nothing on my inbox on gmail. Then I activate Postman, then did all the Postman Oath something on gmail and successfully finished it. But now, contact form 7 doesn’t tell me Thank you, but “Failed to send your message. Please try later or contact the administrator by another method.”

Please Kindly Help me.. on Contact Form 7, is there anything I need to change? On Postman:

Postman is configured.

Postman will send mail via ??SMTP-STARTTLS to smtp.gmail.com:587 using OAuth 2.0 authentication.

Postman has delivered 0 emails for you. View the log.

is there anything I needed to do too? Thank you.

EDITED: When I used, send test email using postman plugin, it gives me this:

I already did the Consent, but what else is wrong?

Communication Error [334] – make sure the Sender Email belongs to the account which provided the Gmail OAuth 2.0 consent.