From Secrets of Paris Newsletter
The Paris Diocese of Notre Dame Cathedral has been in the French press this week warning people about the fake tickets being sold online for the reopening on December 8th. Entrance to Notre Dame will be free, just like before the 2019 fire. There will however be the new option, also free, to reserve a timed-slot entrance in order to avoid long lines. The new platform for this reservation system won't be ready before the fall, and you'll be able to find the link to it directly from the official Notre Dame website.