Hi jreineke, since our Azure CA application supports the Duo Prompt, users can configure Duo to automatically send a push or phone call authentication to their device of choice when completing 2FA. While this is slightly different than configuring autopush on the admin side of things, the user experience will be approximately the same.
A user can set default device and device options during self-enrollment via email-delivered enrollment links or the Duo Prompt. Alternatively, if you enable the self-service portal for your Azure CA application, users can select their default device and device options at any time.