Ecommerce Shopify WordPress Discussion

WP Mail SMTP by WPForms : Gmail Oauth connection disconnected only in one site

I have several sites that are using WP Mail SMTP plugins with the same g-mail account. Today we noticed one site could not sent email and it had below error. Email source: WPForms Mailer: Google / 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", "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" } } ] } } For more details please try running an Email Test or reading the latest error event . Then, I re-added the connection and it worked back. Does anyone know why this was happened. Thank you.
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