Nino, our cyber insurance policy does not allow enabling basic authentication on Exchange. (at least, not on any Internet facing stuff that _they_ can scan, lol)
Ya all must a got to 'em before we did! 😉
But you make an EXCELLENT point. So why don't you tell your Mobile devs to put a user override into the app code so that when we are setting up a new user on it, we can select basic auth as an option to override hybrid auth via the proxy. Cause, right now, the mobile app will ignore basic auth if it can do a proxy hybrid auth, it favors that and does not give the user a way to override it and force basic auth.
Your idea! So off you go and tell them that! It won't help me but I'm sure plenty of admins will enable basic auth to get their users back online. It's also useful to support older Outlook 2007 clients that are "officially" unsupported on later Exchange versions (oops, I probably shouldn't have mentioned that, ha ha)
Also, don't you think that your Mobile people should be also investigating why Playstore isn't handing out the "latest" 4.2411 app version? After all if their fix does involve updating the Mobile app itself, it will be kind of difficult to do that if it's stuck at the 4.2410.0 app which it appears to be. Or possibly the junior programmer forgot to change the version number in the latest binary....