Outlook App Password

APP_PASSWORD 1 Reputation point

I use an Outlook account as an email sender. Recently all my attempt to send email has met with this error

535 5.7.139 Authentication unsuccessful, the request did not meet the criteria to be authenticated successfully. Contact your administrator.

This process was working for several years now and this is the first time I have seen this issue.

  1. is this a new policy?
  2. I was trying to add App Password method on Security Info but the option is not available.
Azure Active Directory
Azure Active Directory
An Azure enterprise identity service that provides single sign-on and multi-factor authentication.
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  1. Andy David - MVP 116.3K Reputation points MVP
  2. Carlos Solís Salazar 11,046 Reputation points

    Hi @APPPASSWORD-7272

    Thank you for asking this question on the **Microsoft Q&A Platform. **

    It looks like the user has the MFA active.

    If you have the privilege, check in your Azure AD the Sign-In logs for the user

    If you have a new policy and require not to use an MFA, use the following method "Authenticate an IMAP, POP or SMTP connection using OAuth"

    Hope this helps,
    Carlos Solís Salazar


    Accept Answer and Upvote, if any of the above helped, this thread can help others in the community looking for remediation for similar issues.
    NOTE: To answer you as quickly as possible, please mention me in your reply.