Blocking download of a file in SharePoint with a specific label

Hello Everyone,

I have a sharepoint site with many files, there are few files I have labeled as "Internal", "client" and "Important". I want block the download of files that has "Important" Label. I have create the session policy in defender for cloud apps using conditional access app control. However the policy is not taking effect.

In conditional access policy, I have selected the app as sharepoint online and in session control I have selected "Use custom Policy"

Below is DCA session policy

kindly advice. Thank you