Question -
Can we use the Microsoft Authenticator app as a means of 2-factor authentication to secure access to  XenMobile integrated O365 environment?

Answer - 
Currently use of Microsoft Authenticator as a means to provide 2-factor authentication is only possible for O365 apps. The security feature is not supported by the Citrix Secure apps (Secure Mail, Secure Notes, Secure Tasks, etc.).

Microsoft Authenticator app could not be incorporated as 2-factor authentication with XenMobile.