AIP / Purview in adobe reader

Hello,

After searching on the forum, i'm asking... hope it will not be duplicate 🙂

We are trying to implement AIP/Purview on Adobe Reader.

We are under an S3 office365 licence and configured lable policies working fine on office365 tooling. 4 levels emplemented C1,C2,C3,C4.. a classic.

I used to test the following website : https://helpx.adobe.com/enterprise/kb/mpip-support-acrobat.html#mpip-labelling

The adobe reader version is 

I have deployed on my registry the following keys:

• in Computer\HKEY_CURRENT_USER\SOFTWARE\Adobe\Adobe Acrobat\DC\MicrosoftAIP 
  • bShowDMB (Dword) to 1
• in Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown
  • bMIPLabelling (Dword) to 1
• in HKLM:\SOFTWARE\WOW6432Node\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown
  • bMIPCheckPolicyOnDocSave (Dword) to 1

I can see the ribbon on my reader application : 

But :

1. I can't update or change label. I'm locked. I can't see the "update" button that should appear (based on website)
2. On save on a non classified document as well nothing is asked.

any idea? I suspect additionnal registries?

Guil.