Still Not Working

I’ve sent the video instructions to a client letting them know how to setup everything. They sent back the Client ID and Client Secret and even took a screenshot of the final page. Everything looked good.

I use SMTP – gmail.com:587 and OAuth 2.0 (requires Client ID and Client Secret). After clicking next, it says permission by google needs to be granted. I have my client sign in to the gmail account and it made her reset the password. Once signed in, it said email could not be sent. Could it be becuase it failed verification for wordpress @ the clients domain name instead of her gmail account listed there?

Here is some info:
Postman SMTP Test (www.domainname.com)
Delete | View | Session Transcript | Resend
Verification failed for <[email protected]> No Such User Here Sender verify failed
…..
WordPress wp_mail Filter(s): wp_staticize_emoji_for_email
WordPress wp_mail_from Filter(s): wordfence::fixWPMailFromAddress
Postman: 1.7.2
Postman Sender Domain (Envelope|Message): gmail.com | gmail.com
Postman Prevent Message Sender Override (Email|Name): No | No
Postman Active Transport: Default (smtp:none:none://localhost:25)
Postman Active Transport Status (Ready|Connected): No | Yes
Postman Selected Transport: SMTP (smtp:tls:oauth2://smtp.gmail.com:587)
Postman Selected Transport Status (Ready|Connected): No | Yes
Postman Deliveries (Success|Fail): 0 | 10

A test with “No” Service Available indicates one or more of these issues:

Your web host has placed a firewall between this site and the Internet
The SMTP hostname is wrong or the mail server does not provide service on this port
Your PHP configuration is preventing outbound connections
Your WordPress configuration is preventing outbound connections
If the issues above can not be resolved, your last option is to configure Postman to use an email account managed by your web host with an SMTP server managed by your web host.