This post will be visible to other SurveyGizmo users. Please do not include personal information you do not want public on the Community. If you wish to contact SurveyGizmo Support directly, please click “Email a Support Hero” on the right.
In my experience, there is a limit (depending on your account level). If you or your account admin accesses the Users page, you should see how many users you have used out of the available users in your account (bottom left on the Users screen).
Hope that helps!