Post SMTP Authentication

Hello,

I am not a professional web developer by any means so I’d really appreciate any help (and preferably simplified!) you can give.

My organization’s website utilizes contact forms, and after years of working here I just now realized that all of the contact form emails have not been going through. We have Post SMTP downloaded on WordPress, and the plugin says it’s configured, but when I try to send a test email this message comes up:

{ “error”: { “code”: 401, “message”: “Request is missing required authentication credential. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.”, “errors”: [ { “message”: “Login Required.”, “domain”: “global”, “reason”: “required”, “location”: “Authorization”, “locationType”: “header” } ], “status”: “UNAUTHENTICATED”, “details”: [ { “@type”: “type.googleapis.com/google.rpc.ErrorInfo”, “reason”: “CREDENTIALS_MISSING”, “domain”: “googleapis.com”, “metadata”: { “method”: “caribou.api.proto.MailboxService.SendMessage”, “service”: “gmail.googleapis.com” } } ] } }

Likewise, when I go into the email log to view the old log, all of the emails show the status as “Bad Request(invalid_grant)”. All of them, going back two years.

I have tried relaunching the wizard: I choose Google API since we use Gmail. All the other info (the from email, client ID) looks good, but I don’t know for sure since I’m not a developer, nor do I know who originally built the site or downloaded this plugin. Regardless, when I click “Connect to Gmail API” I get this screen (see screenshot).

The plugin also says it needs to migrate to new logs; I have done that more than once, and nothing changes; in the new logs, I see no new emails from any date.

I’ve also tried deactivating the plugin and reactivating, but I get the same message when I get to the authentication part.

Thoughts?

Thanks everyone.

The page I need help with: [log in to see the link]