You cannot open PDF files directly to Adobe Reader due to Adobe not releasing their API to Intunes SDK

Workaround : 

• Add Adobe Reader to Protected Files in your MAM policy
• Install Microsoft Onedrive on the device
• Download the file \ Attachment ( It will download it to Onedrive secure area ) 
• Open it with Adobe Reader

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Trying to deploy a MAM policy and the Teams app asked to sign into the Intune Portal App which would not let the user.

1. Uninstall Intune app (Company Policy)
2. Clear Android Settings | Accounts of all work accounts, including any reference to my personal MS account
3. When opening Teams, rather than saying “switch accounts”, I just logged in using my personal account (the username for which was pre-filled)
4. I added the Teams account to the Teams app – prompting the flow of:
   1. Installing the Intune app
   2. Granting device administrator privileges (including giving access to Contacts!)
   3. Getting the message that there is no administrator policy (or some such thing)
   4. Adding a PIN to Teams
5. Getting back to Teams and signing out of my personal account

This seemed to have worked. I went on to test whether the security worked.

1. Anything I downloaded to my device I couldn’t open (format incorrect)
2. I could view stuff in Teams but I couldn’t open it on a native app.

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Recently working on a Proof Of Concept enabling a MAM policy to lockdown and protect an application (Teams) on a device that not enrolled in Intune, and the File Ownership prompt in guides was not appearing.

The Intune License was applied to the user and the user was enabled for  MAM User Scope , and the MAM policy was applied to the User  

However no file ownership still and no encryption of files. Turns out the device has to be joined to the companys Azure AD ( or Local AD and Hybrid ) for this to happen and display the info box

This will show you its enrolled in MAM ( not MDM ) 

After this File Ownership is displayed !

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