Update - 9:45am PT: Tableau engineers have found the cause and have implemented a solution to restore sign in capabilities to Tableau Online. Tableau SOC will continue to monitor the online environments closely for any on going issues. At this time, this incident is being considered resolved.
Tableau Engineers are currently investigating an issue with the Tableau Online environment. At this time customers may not be able to sign in. We apologize for any inconvenience this might cause.
Next Update: 10:00am PT