由于Microsoft已宣布，使用基本身份验证访问Outlook IMAP邮箱将很快不再可能，我正试图找出如何在Java中使用OAUTH2正确打开IMAP邮箱。但我总是得到错误代码“A1 NO AUTHENTICATE failed”。
我正在做的事情如下：
我有一个生成OAUTH2访问令牌的方法：

public String getAuthToken(String tanantId,String clientId,String client_secret) throws ClientProtocolException, IOException {
    CloseableHttpClient client = HttpClients.createDefault();
    HttpPost loginPost = new HttpPost("https://login.microsoftonline.com/" + tanantId + "/oauth2/v2.0/token");
    String scopes = "https://outlook.office365.com/.default";
    String encodedBody = "client_id=" + clientId + "&scope=" + scopes + "&client_secret=" + client_secret
            + "&grant_type=client_credentials";
    loginPost.setEntity(new StringEntity(encodedBody, ContentType.APPLICATION_FORM_URLENCODED));
    loginPost.addHeader(new BasicHeader("cache-control", "no-cache"));
    CloseableHttpResponse loginResponse = client.execute(loginPost);
    InputStream inputStream = loginResponse.getEntity().getContent();
    byte[] response = readAllBytes(inputStream);
    ObjectMapper objectMapper = new ObjectMapper();
    JavaType type = objectMapper.constructType(
            objectMapper.getTypeFactory().constructParametricType(Map.class, String.class, String.class));
    Map<String, String> parsed = new ObjectMapper().readValue(response, type);
    return parsed.get("access_token");
}

生成的令牌似乎是有效的，因为jwt.ms允许我对令牌进行解码。
我尝试使用访问令牌通过XOAUTH2访问邮箱，如下所示：

Properties props = new Properties();

        props.put("mail.store.protocol", "imap");
        props.put("mail.imap.host", "outlook.office365.com");
        props.put("mail.imap.port", "993");
        props.put("mail.imap.ssl.enable", "true");
        props.put("mail.imap.starttls.enable", "true");
        props.put("mail.imap.auth", "true");
        props.put("mail.imap.auth.mechanisms", "XOAUTH2");
        props.put("mail.imap.user", mailAddress);
        props.put("mail.debug", "true");
        props.put("mail.debug.auth", "true");

        // open mailbox....
        String token = getAuthToken(tanantId,clientId,client_secret);
        Session session = Session.getInstance(props);
        session.setDebug(true);
        Store store = session.getStore("imap");
        store.connect("outlook.office365.com", mailAddress, token);

但结果总是AuthenticationFailedException：

* OK The Microsoft Exchange IMAP4 service is ready. [...............AA==]

A0 CAPABILITY

* CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS MOVE ID UNSELECT CHILDREN IDLE NAMESPACE LITERAL+

A0 OK CAPABILITY completed.
DEBUG IMAP: AUTH: PLAIN
DEBUG IMAP: AUTH: XOAUTH2
DEBUG IMAP: protocolConnect login, host=outlook.office365.com, user=xxx@yyy.com, password=<non-null>
A1 AUTHENTICATE XOAUTH2 ....E=
A1 NO AUTHENTICATE failed.
javax.mail.AuthenticationFailedException: AUTHENTICATE failed.

从this similar question我现在怀疑我的访问令牌实际上有太少的权限访问邮箱。
我该如何澄清这一点呢？例如，当我解码令牌时，我可以看到它不包含scp或roles属性。这是否表明令牌是错误的？