Here's why logging in with your Google account isn't working right now
Google's tool for logging into third-party services went down Tuesday morning, paralyzing individuals and organizations who depend on it to access various systems and services.
Google OAuth is the system that enables you do log into a service (like, say, Etsy or Trello) with your Google or Gmail account. Many Twitter users reported the API associated with Google OAuth wasn't working at about 9:20 a.m. ET on Tuesday, locking them out of various services.
The outage follows a possibly unrelated Gmail disruption that occurred on Monday, according to Google's Apps Dashboard, which monitors service disruptions and outages across Google services.