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I have configured Gmail Client ID and Client Secret in plugin settings. But when I click “Allow plugin to send emails using your Google account”, it gives me Error: invalid_request. Missing required parameter: client_id.
Screenshot
I have checked and verified there is not extra space or something. Copied both Client ID and Client Secret many times but no luck.
This error only occurs with PHP version 7.2. With PHP 5.6 this error does not appear.