Forum Discussion

Brass Contributor

Feb 09, 2023

SMTP XOAUTH suddenly failing for Outlook personal with '535 5.7.3 Authentication unsuccessful'

Please see here for the details: https://techcommunity.microsoft.com/t5/outlook/smtp-xoauth-suddenly-failing-for-outlook-personal-with-535-5-7-3/m-p/3734392 Note that this is about personal a...

identity and access management

Enzo_Tech

Copper Contributor

Apr 14, 2023

I also confirmed that until now it is not working.

535 5.7.3 Authentication unsuccessful [SJ0PR13CA0189.namprd13.prod.outlook.com 2023-04-14T01:41:59.958Z 08DB3BD5C46109BA]

I am using offline_access and SMTP.Send as scope via Device Code Flow
These are the endpoints that I used to get exchange device code for an access token to be able to send email using consumer accounts using oauth2

device_endpoint = "https://login.microsoftonline.com/common/oauth2/v2.0/devicecode",
token_endpoint = "https://login.microsoftonline.com/common/oauth2/v2.0/token"