We are hoping this provides additional clarification and help in buying online tickets to the Eiffel Tower.
As most know, tickets to the top of the Eiffel tower ( two elevators) go on sale 60 days in advance. Tickets permitting you to walk to the second floor then take the elevator to the top apparently go on sale 14 days in advance.
Tickets to the top of the Eiffel Tower seem to go on sale 2x/ day. The first ticket sale is at Midnight Paris time. Additional tickets were released at 4:45 am.
Importantly, we learned that it is necessary to adjust the date/time settings on your computer or the device you are using to order tickets to Paris time. This seems to be necessary to make the online purchase, so that the ticketing system and your device are on the same time.