Hi,
Office 365 is currently not supported in the Q&A forums, the supported products are listed over here https://learn.microsoft.com/en-us/answers/products (more to be added later on).
You can ask the experts in the dedicated French Office 365 Billing forum over here:
https://answers.microsoft.com/fr-fr/msoffice/forum/msoffice_account
(Please don't forget to accept helpful replies as answer)
Best regards,
Leon