1 of 1 people found this helpful
firstname.lastname@example.org should be able to give you an answer.
There are some notes in the Comments section here about pricing and concurrent users:
In the comments, Ellie Fields states: "...the user pricing is for named users, not concurrent. And for now Tableau Online does not integrate with AD or OpenAM-- Tableau Server does integrate with ActiveDirectory and would be a good option if that's a requirement."