There have been multiple reports about problems connecting to a free.fr email account. It may not be your client settings.
https://learn.microsoft.com/en-us/answers/questions/5774387/outlook-clefs
I worked a similar issue for a Reddit user but we could not find any solution.
https://www.reddit.com/r/Outlook/comments/1r3506g/adresse_email_free_avec_outlook_classique/