ERROR : Mail authentication failed....

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Posted on by CU21011313-0

Hi, dev community I'm trying to configure email in d365 f&o from email parameters even I'm providing correct credentials for username and password but every time I try testing the connection this error comes!
any solution for this or how to correct this issue

answers are highly appreciated
complete error :

ERROR : Mail authentication failed. Please verify your SMTP user name and password. If your SMTP server doesn't support authentication, please clear the SMTP user name and password. Server smtp.office365.com:587 using SSL/TLS supports the following authentication options: LOGIN, XOAUTH2

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Dynamics 365 Finance

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Mohamed Amine Mahmoudi 26,390 Super User 2025 Season 2 on at

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Moved from FastTrack for Dynamics 365 form

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Verified answer

Mohamed Amine Mahmoudi 26,390 Super User 2025 Season 2 on at

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Hi @CU21011313-0,

You would also need to verify that MFA registration is disabled for that mailbox

App passwords do not work with modern auth: https://learn.microsoft.com/en-us/entra/identity/authentication/howto-mfa-app-passwords

Best regards,

Mohamed Amine MAHMOUDI

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