This blog article describes how to proceed if you turned on multi-factor authentification and you are using apps that connect you to your Office 365 account. 

If you turn on multi-factor authentification you can still use the Office 365 connection type, but you need to generate for this user an app-password. An app password is a code that gives an app or device permission to access your Office 365 account. For example, if you're using Outlook 2016 or earlier with Office 365, you will need to create an app password.

Please follow the steps in the corresponding article from Microsoft about how to create an app password for Office 365.  

If you do not want to use an app password you should use the recommended way and use the Server2Server connection type when setting up our service. For more information about how to set up a service have a look the corresponding videos on our YouTube Channel: 

• AttachmentExtractor Online Service Configuration
• DocumentsCorePack Online Service Configuration
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That’s it! We appreciate your feedback! Please share your thoughts by sending an email to support@mscrm-addons.com.