Access Denied from Adobe Cloud Storage

My Android Adobe Acrobat has latest version 23.8.0.29156.

In Android Adobe Acrobat, Settings -> Subscriptions -> Adobe cloud storage(Free storage and file sharing), click "Sign in" button, select sign in with Adobe ID, after sign in, it shows "You have successfully signed in", then it prompt up a dialog "Access Denied" with message "You do not have access to this service. Contact your IT administrator to gain access, or sign in with a different ID".(see attachment) So whether my account should have privilege to access free storage in Adobe cloud storage?

This failure access just happens recently. I even don't get chance to backup all my documents previously uploaded to the Adobe Cloud Storage.