Microsoft has changed securities for mails using now Oauth2 . Extern app like thunderbird on mac must used a password based on Oauth2 on a mac and mail works correctly.

But If you want to add the same values on another mac, the system replies to log on a server like school server,enterprise server. If you don't have external server and you have only a personal mail you cannot use hotmail ,outlook on other mac. What can we do to avoid this and to have mails on several mac PC's.