Bonjour,
Pour info, le planificateur ne marche pas du tout, il faut cliquer 50 fois sur l horaire qui nous convient et quand enfin on y arrive, il multiplie par deux le montant des reservations alirs que tout est tres bien renseigné pour deux personnes des le debut…
Je commence a regretter sérieusement de m etre embarqué la dedans.....
Here Tutorial were you can buy reservations (interrail.eu works not good, and costs most of the times more)
How to get Reservations 
| Community
We will try to help you here as much as we can.
As
Also SNCF should be able to help you with reservations.
Here is some useful information from the experienced travellers in the Community regarding both planning, reservations and activation of pass and travel days.
Planning
The rail planner is normally not up to date, as it only is updated once a month, so to be sure of the time table you better check the timetable and availability on the websites of the national railways. The bigger national railways, like DB (Germany) SBB (Switzerland) and ÖBB (Austria) cover several countries.
Reservations
The advice from the experienced travellers in the community is to use other ways to make reservations than the Interrail/Eurail website. You can look at the guide in the link:
https://community.eurail.com/train-connections-reservations-47/how-to-get-reservations-105
If you, after having looked at the guide, have questions about how to make specific reservation, please give your travel details (departure date, time and route) preferably in a new topic, and you will get advice.
Please note that Interrail/Eurail charges an extra fee of 2 EUR per person and ticket in addition to the fee for the seat reservation.
Activation of pass
During the activation process, when you choose the start day of the validity of the pass, the first day of the validity period is automatically made a travel day, even if you don't enter a journey, the advice is therefore not to activate the pass before the first travel day as you only can deactivate the pass before 00.00 on the day the validity starts. If your travel plans change in the last moment you will loose travel days if you have activated the pass in advance.
It can be wise to make a test and activate the pass with a start date well in the future and then deactivate the pass immediately, just to see that everything works.
Activation of travel day
The advice from the experienced travellers in the community is also never to activate a travel day, that is connect a journey to your pass, until just before boarding the train, otherwise you might loose a travel day if your travel plans change in a late stage You can't delete a travel day in the past. A travel day can only be deleted until 23.59 CET the day before the travel day
avez-vous déjà acheté vos pass ? assurez-vous de demander à quelqu'un dans la communauté qui a accès à la disponibilité réelle des places de train pour vérifier que ce que vous voulez est réellement disponible.
J'ai acheté mes laissez-passer et j'ai découvert quand je suis allé réserver des sièges qu'ils n'étaient plus disponibles ou que je devais me rendre dans une gare pour réserver un siège.
et maintenant ils ne rembourseront que 85% de mon argent ! 
Or next ALterative: bypass all these trains with RES-though any FRancoise who uses this national society in the hexagone should know about REServations. Go to countries where nearly all trains are without (yes, they exist-to the utmost surprise of many) and see there. You can also set this app/planner to NO REServ-and see what it spews out
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