Fetching Emails from office 365 raises error 11 when searching for keywords

[CarrotManMatt]

Attempting to fetch emails from an Office 365 IMAP MailBox raises this error code when searching for any keyword:
imaplib.IMAP4.error: SEARCH command error: BAD [b'Command Argument Error. 11']

This is my code:

with MailBox("outlook.office365.com").login(test@outlook.com, p4s5w0rd) as mailbox:
        for message in mailbox.fetch(A(keyword="TEST"), miss_no_uid=True, headers_only=True):
            print(message.from_)

[ikvk]

Seems that office 365 not supports keyword arg

[CarrotManMatt]

Ok, thanks! What would you suggest is the best flag to use (that office 365 supports) to mark an email as processed (i.e. flag is false by default then set to true).

The other quirk/issue that may be related is that I can fetch emails given the other search criteria (e.g. flagged, seen, answered), but cannot change the values using the mailbox.flag() function?

[ikvk]

1. check mark_seen arg
2. mail server may not support some features
3. I offen use moving processed mails to another folder, this is more robust

[CarrotManMatt]

Thanks for your help!