We are not able to open pdf files from Onedrive in Acrobat Reader for Intune.

Unfortunately I'm unable to reproduce your issue.

Here is --exactly-- what I have setup.  Let me know of any discrepancies from what you have so we can figure this out.

1) In the Intune console we are pointing to ‎Adobe Acrobat Reader Intune and OneDrive on the App Store

2) Device compliance - No policies

3) Device configuration - 1 property set "Viewing corporate documents in unmanaged apps - BLOCK"

4) Using MDM

Then from inside OneDrive:

1) Tap on the 3 dots on the right side of the Files for a PDF file

2) Tap on Open in Another app

3) Share appears showing ONLY OneDrive and Copy to Adobe Acrobat (confirming that Intune protection is enabled)

4) Tap on Copy to Adobe Acrobat

Result: Document Opens in Acrobat

Can you provide any other details?

Thank you,

Dylan

Are you using MDM, MAM, or neither?  Are OneDrive and Acrobat logged into the same Microsoft account?  If MDM or MAM, do you know what Intune policies are set?

Thank you,

Dylan Ashe