Connect to email using OAUTH 2.0

Question

Connect to email using OAUTH 2.0

Anonymous

I am trying to connect to the email outlook using OAUTH 2.0. But it get this error : imaplib.error: AUTHENTICATE failed.

Here is my code :

from imap_tools import Any, MailBox import msal

class CustomBaseException(Exception):def __init__(self, **kwargs: Any):super().__init__()self.kwargs = kwargs

def __repr__(self) -> str:return f"{self.__class__.__name__}: {repr(self.kwargs)}"

def __str__(self) -> str:return repr(self)

class AccessTokenNotRetrieved(CustomBaseException):pass

def init_mailbox_with_xoauth2() -> MailBox: app = msal.ConfidentialClientApplication(client_id=client_id,authority='https://login.microsoftonline.com/tenant_id',client_credential=client_secret)

scope = ['https://outlook.office365.com/.default']access_token_dict_key = "access_token"token = app.acquire_token_silent(scope, account=None)

if not token:token = app.acquire_token_for_client(scopes=scope)

if access_token_dict_key in token:access_token = token[access_token_dict_key]print(access_token)mailbox = MailBox('outlook.office365.com').xoauth2('trolyao_******@outlook.com', access_token, initial_folder='INBOX')

return mailbox

else:raise AccessTokenNotRetrieved(message="Unable to retrieve access token from AAD.",error=token.get("error"),error_description=token.get("error_description"),correlation_id=token.get("correlation_id") # You may need this when reporting a bug)

print(init_mailbox_with_xoauth2())

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3 answers

Answer 1

I'm sorry to hear that my suggestions did not work

If you've already tried all the troubleshooting steps and the issue persists, it might be best to report this issue to Microsoft Support. They have the resources to investigate this issue further and might be able to provide a solution or a workaround.

Once you have feedback after contacting them, please let us have feedback here too

Kind regards, Adeyemi

Answer 2

Anonymous

I have tried you suggestion. But it didn't work. I think it is because i have setting wrong the oauth 2.0. But when I when to the admin center, I cannot access to the User Setting. It has this error. Do you know how to fix it ? Thank you

0 comments

Answer 3

Hello

I’m Adeyemi and I’d be happy to help you with your question.

The error you're encountering, imaplib.error: AUTHENTICATE failed, is a common issue when trying to authenticate with IMAPLIB and OAuth2.0¹. Here are a few things you could try to resolve this issue:

Check the Scope: Ensure that the scope is correct for IMAP on Office365. It should be [https://outlook.office365.com/.default](https://outlook.office365.com/.default`)
Format the Token Correctly: The token needs to be formatted correctly as a SASL2 token. Here's an example of how to do this:

def GenerateOAuth2String(username, access\_token):
    auth\_string = 'user=%s\\1auth=Bearer %s\\1\\1' % (username, access\_token)
    return auth\_string

Register the Service Principal in Exchange: If you get errors running the above, it's most likely you haven't registered the service principal in Exchange or granted permissions to the Mailbox
Check for Bugs in IMAPLIB: There might be a bug in IMAPLIB itself. Some users have reported that the IMAP server outlook.office365.com does not accept XAUTH2 anymore, requires additional/different scopes, or tokens that have been generated differently.

I hope this helps.

Give back to the community. Help the next person who has this issue by indicating if this reply solved your problem. Click Yes or No below.

Kind regards, Adeyemi

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Connect to email using OAUTH 2.0

3 answers