Unfortunately, Duo is proprietary and does not document any way for third party apps to implement support for their push based 2FA system.

Also, Anbox does not include the proprietary Google Play Services components, and there's no bridge for notifications.

@kugiigi yeah that's what I'm referring to. I couldn't think of the phrase.

I confirm and bug report done :
https://github.com/ubports/messaging-app/issues/192

FYI for those that are having the same issue with 'not enough free space', see this post.

@Lakotaubp thanks!

Nevermind, my data seems to be working now without it.