I’m setting up SMTP for my wife’s website that’s hosted on WP. We originally used DreamHost but that wasn’t working, so have tried setting up connecting through the Gmail API.

We are running WP 5.7 and the latest version of the WP Mail SMTP plugin(v2.6.0). Upon advice from other threads, I deactivated and deleted the WP Mail SMTP plugin, reinstalled it, and then tried setting up the SMTP through Gmail from scratch.

I get the following error:

EMAIL DELIVERY ERROR: the plugin WP Mail SMTP v2.6.0 logged this error during the last time it tried to send an email:

Mailer: Gmail
{
"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"
}
}

I have validated that I’m using the correct Client ID and Client Secret from the Google API, so I don’t know what else to do.

Any help is much appreciated, TIA!!

Thanks for reaching out. That indicates your Google account is not connected properly. When you get a chance, could you please share what happens when you click on ‘Allow plugin to send emails using your Google account’ button?

Regards,

Thanks for writing that up. Unfortunately, there isn’t a way to directly upload the screenshots in the comments. You can upload the image to online site like this site and get a link.

Thanks!

I’ve uploaded my troubleshooting document here: https://www.dropbox.com/s/nn1iol5sjcm08rm/Carly%20Gmail%20API%20SMTP%20Issue%20Response.docx?dl=0

Look forward to your advice, thanks!

Thanks for the details! Could you please temporarily deactivate the Total Upkeep plugin and authorize the Google account once again? If the authentication success, you can re-activate the Total Upkeep plugin.

I hope this helps!