Sometimes, you may see a user on your board listed as 'Invited', which we refer to as a virtual user.
Virtual users are placeholder accounts. Trello creates them when you've invited a user to a board or Workspace, but the user hasn't finished the signup process on their own. If they didn’t receive the invitation, try re-inviting them to your board, and check this article for more troubleshooting steps.
Once a user signs up for Trello with the email address that was used to invite them, you'll see the ‘Invited' change to a username.
While a user is a virtual user, you can still add them to cards or boards in order to assign them tasks.
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