ACT Sept test dates

We tried to register for the September 8th ACT test date - not possible. The date is on the ACT page, but when you log on to register, it says that there are no more dates (beyond the July date he is registered for) available for registration. ?? And the deadline is August? Anyone know when these dates will be available?

Registration opens in July for all ACT test dates for any given testing year.

Thank you! We will log on July 1!