Open PDFs in OneDrive for Business with Intune MAM
OneDrive for Business and Adobe Acrobat Reader for Intune (iOS) is MAM Enabled. When trying to open a PDF in ONeDrive for Business from the Adobe Reader application, you get the error "The document cannot be opened because it is corrupted or damaged."
The Adobe app can open PDF's from a personal OneDrive, its only when on a OneDrive for business controlled by Intune MAM (App Protection Policies) it has the issue.
I believe this is a bug with Adobe Acrobat Reader for Intune (iOS)
We are running into the same issue in our testing. It does work fine if you transfer/open the document from onedrive or outlook man protected app to the Adobe Acrobat Reader for Intune (IOS) app. When you try and open the same document directly from the reader it fails with the above referenced error.