How to launch a configuration for Outlook Mail & Calendar app for iOS?
iOS platform does support app configuration just like Android Enterprise platform. However, while the latter platform has a simple GUI in the web console (see screenshot below), the former platform currently needs to use configuration file to define the required configuration(s).
I haven't got everything to check things out for iOS platform, but I think you can try the following in the "Configuration Command" field in "Application Configuration" tab of an "Outlook" app entry in an iOS App-Catalogue rule:
Let me know if the above works or not.