Per the Eiffel Tower Facebook page:
Tour Eiffel - We are truly sorry for the misunderstanding and induced frustration. All tickets from 1 to 24 July were made available today. As our online box office works on a D-60 release basis, the tickets after July 24th will follow in the coming days (still at 8.30am). For exemple, release of tickets for July 26th will follow on May 27th, for July 27th on May 28th, etc.