Version d'Outlook pour Teams visio réunion

Hello Virginie2005.  When you say "organize" a meeting from Outlook, do you mean create a Teams meeting?  Check out this article and see if it solves the issue.  https://support.office.com/en-us/article/schedule-a-teams-meeting-from-outlook-883cc15c-580f-441a-92ea-0992c00a9b0f

Be sure to have the Teams add-in installed.