There was an error while processing the authentication request.

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I’ve just installed 2.8.0 and get the error message “There was an error while processing the authentication request. Please try again.” when I click orange button “Allow plugin to send emails using your Google account”.

I’m using a legacy G Suite account. I copied and recopied the Client ID and Client Secret multiple times, always getting the error message.

I turned off iThemes Security plugin and still get the error message.

I’ve deleted the OAuth 2.0 Client ID and recreated it multiple times and still get the error message.

What’s the next step in troubleshooting this?

Thanks.