Azure App Error For Office 365 Email

Hello,

I have followed your guide here : https://tech-banker.com/how-to-setup-office-365-smtp-with-wp-mail-bank/ and created an AP via the Azure portal for my 365 email. However when I try to confirm the settings I get the following error :

unauthorized_client: The client does not exist or is not enabled for consumers. If you are the application developer, configure a new application through the App Registrations in the Azure Portal at https://go.microsoft.com/fwlink/?linkid=2083908.

Just wondering if you guys had any idea how I could fix this.

kind regards
Dimitri