How do I login to outlook.com with IMAP using MailKit?

Question

I'm attepting to use MailKit to access the emails in my personal outlook.com account.

I'm using the IMAP settings recommended by Microsoft but when I call _imapClient.Authenticate with my username and password I get a 'LOGON failed' exception returned.

A few sites have directed me to use Oauth2 to authenticate but this requires I register my app in the Azure portal which I don't have access to. My account being a personal one.

        private ImapClient _imapClient;
        private MailboxConfiguration _mailboxConfiguration;

        public ConfiguredMailbox(MailboxConfiguration mailboxConfiguration, CancellationToken cancellationToken)
        { 
            _mailboxConfiguration = mailboxConfiguration;
            _imapClient = new ImapClient();
            _imapClient.Connect(_mailboxConfiguration.URL, _mailboxConfiguration.Port, true, cancellationToken);

            _imapClient.Authenticate(_mailboxConfiguration.Username, _mailboxConfiguration.Password, cancellationToken);
            _imapClient.Inbox.Open(FolderAccess.ReadWrite, cancellationToken);
        }

If I've previously logged in with a browser, this will work for about a minute. I'm guessing that the token issued to the browser is also being used.

I did try implemeting the Oauth2 method suggested but I just got an error basically saying you can't do this for MSA accounts.