This guide goes over setting up iOS devices after Intune Mobile Application Management has been enabled. 

For more information, see: Intune Mobile Application Management - Overview | Knowledge Base | Patriot Growth Insurance Services (freshservice.com) 

Android users, see: Intune Mobile Application Management - Android : Patriot Growth Insurance Services (freshservice.com) 

Pin Setup Process - iOS

Once you have been added to the Intune Mobile group, the next you access a protected up, you will receive a pop-up that the app is now protected and must be restarted.

After restarting the app, you will receive this confirmation. 

After selecting OK, you will be prompted to create and confirm a PIN .

The app will ask you if you want to add another account. Select Dismiss to continue.

Now that your phone is enrolled in Intune, you will need to force close and then open any protected apps (Outlook, etc.)

See Apple’s support page on how to force close an app: https://support.apple.com/en-us/HT201330