By default, the QR code shown by Office 365 / Azure AD contains a URI that is specific to Microsoft Authenticator and will not work with other authenticators such as Yubico Authenticator. In order to obtain a QR code that can be used with Yubico Authenticator, you can follow the steps below on the multifactor authentication registration page.
- Select the Use verification without notifications option and click Set up.
- In the dialog that pops up, click Configure app without notifications.
- In Yubico Authenticator select File -> Scan QR Code.