When trying to view certain file attachments (specifically jpg images) on Android Outlook Mobile it displays the error message below:

No Available Apps

There are no apps on this device that your organization allows to open this attachment

This is due to a MAM policy being configured in Azure AD. Installing the AIP app below allowed the attachment to be opened.

Azure Information Protection: https://play.google.com/store/apps/details?id=com.microsoft.ipviewer&hl=en&rdid=com.microsoft.ipviewer

If hyperlinks open with the "No Available Apps" error then installing the Managed Browser and adding that to the policy should work.