You must have Admin rights in your Office365 account to do this.
- Open the Microsoft 365 admin center and go to Users > Active users.
- Select the user, and in the flyout that appears, click Mail.
- In the Email apps section, click Manage email apps.
- Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.
- When you're finished, click Save changes.
Read the full Office 365 Help article here.
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