I recently was presented this error in setup of 365 using FluentSMTP.
The azure app registration had to be made with the email licensed intended email account being used e.g. website@example.com, and not as e.g. the global admin. The FluentSMTP documentation in creating the app though quite good might be possible to improve in this.
Thank you for the info! The email I’m trying to use is shipping@example.com which is not the admin email. Does it need to be “website” specifically?
it doesn’t require it to be “website”@domain. but as you describe shipping@example.com should be the 365 account you are using in the site, signing into 365 and creating an app registration with (be sure it’s not actually signing in as another 365 user).
https://fluentsmtp.com/docs/configure-fluentsmtp-with-microsoft-outlook-office/
Note also at (2) the correct “Supported Account Types” is selected in creating the app registration, and you copy the Value, not the Secret ID, of the Secret.
Hello @benicole,
I appreciate you sharing the additional details, including the specific considerations about the 365 account used for app registration and the importance of selecting the correct “Supported Account Types” and copying the “Value” rather than the “Secret ID” for the secret. It sounds like you’ve been quite diligent in troubleshooting this already, and we appreciate that effort.
If the issue still persists, and as we’ve noted that this specific “not found” error can indeed arise from a variety of underlying reasons, we would be delighted to investigate this further for you.
To help us pinpoint the exact cause and provide a precise solution, we request you to create a support ticket on the WPManageNinja support portal.
Once we have this information, we’ll dive right in to diagnose the problem.
