I am also having the same issue as Kimmo. There doesn't seem to be any information regarding this.
It would be of great help if you could you specify which MAM policy is not working for Acrobat Intune on iOS.
When you say "For the iOS version of Adobe Acrobat for Intune I cannot define a MAM policy when deploying the app", are you not seeing the option to apply MAM policies in the console?
Are you also referring to the support of MAM policies by the application running on a device which is not managed? Acrobat Intune only supports the MAM policies when the device is managed by the system.
We would like to understand the exact problem. Please attach screenshots and workflows to communicate the issue. This will help us in triaging the problem.
The issue should be resolved with the latest deployment of Microsoft Intune and now Adobe Acrobat should be identified as a managed app in the system.
Please let us know if you still face issues.