Hi there,
If you are encountering a “Forbidden” error when using the Office 365 API, it is likely that the API endpoint you are trying to access does not exist or is not accessible or has a permission issue. Here are a few potential reasons why you might be seeing this error:
- Incorrect App Callback URL: Double-check the URL you use to access the API endpoint provided by Fluent SMTP settings. Make sure that it is spelled correctly and includes any necessary parameters.
- Insufficient permissions: It is likely that the email address you are trying to use as the sender has no Mailbox created, has no permission to send emails, or it does not have any valid Office365 subscription.
- Incorrect Account Type: It is possible that you have selected the wrong account type while creating the Azure App. it must be “Accounts in any organizational directory (Any Azure AD directory – Multitenant) and personal Microsoft accounts (e.g. Skype, Xbox)”
- Incorrect Logged-in Account: When you click on the authorize button it asks you to log in to the Microsoft account and it should be using the same email or same account that is used to create the Azure App.
- Domain Verification: Also recheck that you have verified your domains inside Microsoft Office365.
If none of these solutions resolve your issue, you may consult the Office 365 API documentation here again: https://fluentsmtp.com/docs/setup-outlook-with-fluentsmtp/ or reach out to Microsoft support for further assistance.
Thank you.
